Strodav Loc: Houston, Tx

I have both cropped and a FF body. I started with a DX body and a couple of DX lenses then added another DX body. After a few months I know I would eventually want a FF body, so have purchased (mostly used) FF lenses after that. I still use the cropped bodies for wildlife, especially birding, has they have an inherent zoom, in my case x1.5. I also like the cropped bodies for macro photography and sports photography. I use the FF for landscape, astrophotography, and portraits. So each has its advantages. Looks like camera technology is moving towards mirrorless. So like rgrenaderphot suggests, I'd look at a FF EOS R FF, but I'd keep your existing gear.

Keen

Why does it have to be 'either / or'? Instead of having Crop Frame, OR Full Frame, why not use both? I don't know about Canon digitals, but Nikons use the same lenses on both Crop, and Full, Frame cameras. The lenses perform differently on each format, but both DX, and FX, lenses use Nikon F Mounts. So, you can use the same 20mm Nikon lens on a DX Crop Frame Nikon D7200 camera, and an FX Full Frame Nikon D750 camera. On the FX Full Frame cameras, the Full Frame Nikon 20mm f/1.8 G ED lens provides a 20mm field of view image. On a DX Crop Frame image, that same 20mm lens provides an image with the field of view of a 30mm lens. By having two Nikon cameras-an FX, and a DX, you effectively get two lenses out of one. Many Enthusiast amateur, and most Professional, photographers carry two camera, one for usual, and the other for backup...in case the usual item breaks down. Nikon's now discontinued "one inch" CX mirrorless cameras ( N1-J5, N1-V3, etc ), and Nikon's newest Z Mount mirrorless cameras, do not use the Nikon F mount, but do have accessory adaptors which can mount F Mount lenses to the N mount, and Z mount,cameras. With Nikon, you can use the same one lens on different format cameras. If Canon does not give you such adaptability, perhaps you should sell all of your Canon gear, eat any loss, and get into Nikon. I am using recent Nikon DX, Nikon FX, and Nikon CX cameras, and all of my Nikon lenses work on all of them. Some much older lenses (Pre Ai, Ai, etc) may not work on all newer cameras. My 20mm lens has a 20mm field of view on the FX camera, a 30mm field of view on the DX camera, and a 54mm field of view on the CX camera. The Z mount cameras are Full Frame, so the lens would have a 20mm field of view on them. I don't have to throw away, or sell, all of my lenses, filters, etc, every time I change cameras, or formats.

Robyn H Loc: MainLine PA

If you want a full frame camera you don't need to justify it by getting advice from the rank and file, all you need is the money to pay for it. My personal opinion of the photos you posted, only the first one would really have benefited from full frame. But, it's not really a matter of need, it's more a matter of want and if you want a full frame and can afford a full frame then get your self that full frame.

I have both full and crop frame DSLR'S. I use a full frame for my daily shooter and crop for more specific shooting.
Right now Canon has the body you want refurbished for a few cents under $1300 USD, not a bad price for 26 megapixels, a digic 7 processor and a fully articulated touch screen; and if you don't have enough cash, Canon will finance it interest free for 12 months, which would be roughly $114ish per month with tax. This way you keep your 70D, I've got one and use it often, and get that 6D mk II you want. Heck, I just might buy one.
As for the EOS R, it's a good camera but it's also the first of the new generation of FF MILC'S from Canon, and I personally avoid bleeding edge technology. Wait until the technology matures a bit more. What's good now will only get better in the future.
Bottom line, you've got the info you need, now go for it...!

Gene51 Loc: Yonkers, NY, now in LSD (LowerSlowerDelaware)

If you are after better image quality, particularly when using higher ISOs - you will have few regrets moving up to FF. There are some caveats - cost, weight, size being the most obvious. You'll either need longer lenses or end up cropping more for your sports images.

I believe at least 4 of your lenses will work on a 6D -

Whether it is worth it for you is a personal choice based on your specific criteria. I bought a Nikon D700 in 2011 and even though I kept my D300 for a while, I ended up not using it and sold it a year later, and purchased a D3S, using the D700 as a backup.

Keen

Many folks-Amateur, and Professional-swear by FF, and want nothing but. Many more are as firm in their dedication to CF. Many others use both FF, and CF. It is a matter of personal taste. Also, FF lenses give a wider field of view. I afford three format systems-DX, FX, and CX-by shopping hard, buying used / factory refurbished, using layaways, and saving up a bit before buying. I sometimes sell older gear...Pentax, and Canon, 35mm film stuff mostly. Some people still like to use it. There are people who would buy your Canon digital stuff, but you may take time finding them. Come over to Nikon. A D7100, or D7200, would be good Crop Frame choices, and a D610, or D750, would be good Full Frame choices. They can be had for not a lot of money. Adorama has a D7100 (body only) for $449.00, and a D7200 for $649.00. They also have a D610 for $759.00, and a D750 for $1399.99...none of which is exactly cheap, but it shouldn't break the bank. Other vendors may have even better prices. I recently bought an old Nikon 35mm film format lens (Full Frame). It was a 28-80mm f/3.3-5.6-which fits both my FX, and DX, cameras, and my CX camera with an adaptor. In effect, then, it is: a 28-80mm lens, and a 42-120mm, lens, and a 75.6-216mm lens...depending upon which camera I put it on. IT ONLY COST ME $29.00 !! I love Nikon. Can you tell? You don't need the absolute newest items to get great images. Get good stuff-even if old, or discontinued even-and use it well. Depending upon how new your Nikon camera is, you can use lenses made as long ago as about 1957. I have lenses from the 1980 to 2006 era. Many bargain priced items (old, out of fad favor, discontinued, etc) are available to those who shop for them. Kenrockwell.com has great gear reviews, advice, and a Nikon lens-camera compatibility chart. I use: Ai-S, AF-D, and AFS, lenses. If you are going to the trouble of changing formats, you may as well change brands, as well. Dump Canon, and go Nikon. Nikon offers more compatibility between formats, more compatibility between older and newer gear, and so offers more bargain priced opportunities to photogs on a budget.

jerryc41 Loc: Catskill Mts of NY

All the technical babble aside, any decent camera can take great pictures. A full frame camera has advantages over a crop sensor, no doubt about it. If you really feel the urge to get one, go for it! Life's too short to deny yourself and settle. The movable screen is a great convenience. I have to remember to use mine.

Some relevant articles -
http://www.diyphotography.net/crop-vs-full-frame-sensor-different-cameras-perform-lens/
http://www.nikonusa.com/en/learn-and-explore/article/g588ouey/the-dx-and-fx-formats.html
https://www.borrowlenses.com/blog/new-dslr-owners-what-you-must-know-about-full-frame-vs-crop-frame-sensors-before-choosing-a-lens/
http://www.bhphotovideo.com/explora/photography/features/dx-vs-fx-its-not-debate-its-choice
http://www.lightstalking.com/cameras-sensor-size/
http://neilvn.com/tangents/full-frame-vs-crop-sensor-cameras-comparison-depth-of-field/

i080123

Your pictures are terrific and stick with the 70D. I have a friend who left his 70D on a rental car shuttle returning from vacation. He bought the same camera, the next day.

billnikon Loc: Pennsylvania/Ohio/Florida/Maui/Oregon/Vermont

Based on the images you have posted I see no reason for you to go to full frame. You have a grasp on composition, texture, and style. Your eye (the way you see things) will not change with a camera, FF or cropped. Keep up the good work. I use both FF and cropped. The only reason I use crop is for wildlife, I like the extra reach. I use FF for everything else.
You might enjoy how wide you can go with FF, foreground background shots are done well with a FF. Your images with cropped are very sharp so I do not see a big advantage for you going FF outside of the use of wides.
So, carry on, have fun, sell a bunch of images for big bucks and then buy a FF when your ready.

scubadoc Loc: Sarasota, FL

Rent a ff body and the one or two lenses that you most commonly use. Shoot several hundred images according to your favorite style. One of two things will happen: you will fall in love with ff, or you will realize that what you have been doing all along with your current equipment will not significantly improve by moving to ff. You can rent most anything through lensrentals.com.

Flickwet Loc: NEOhio

Definitly go full frame, you can pick mine out of the trash, after seeing your work thats where mine belongs

bobmcculloch Loc: NYC, NY

Unless I had a real identified need I wouldn't.

Architect1776 Loc: In my mind

Canon does not have FX or DX lenses. So those terms might be meaningless.

PeterBergh

Canon's terms for FX and DX lenses are EF and EF-S, respectively.

zug55 Loc: Naivasha, Kenya, and Austin, Texas

Your sample images show that you can do great photography with a crop-sensor camera. Full-frame cameras have clear benefits, as many pointed out. But full-frame equipment also is more expensive, both cameras and lenses.

To me, making a switch to a full-frame camera without full-frame lenses does not make much sense. So I would only make the switch if you are willing to buy some full-frame lenses. Otherwise I would stick with what you have.

If you are serious about full-frame, I would look at mirrorless cameras. Given that all the major camera companies now put all their energies into mirrorless technology, I would not recommend that you start investing in a full-frame DSLR system at this point. (If you had full-frame lenses already that would be a different question.) The Sony A7 series is outstanding, but according to reviews the new Canon mirrorless cameras are quite good as well.

PS: Full disclosure: I made the switch from a Nikon D7100 to the Sony A7 III in April. I have no regrets about the switch, and I definitely see a difference in the quality of my images.

Architect1776 Loc: In my mind

Thank your husband from me for his service to our nation.
The Canon 6D MII you are looking at is a great FF camera to get started with and has the feature set you are looking for. It appears your lenses are all very excellent quality FF lenses so the transition should work just fine.
The nice thing is there is no worry about losing any features of the lenses in the Canon system as all EF lenses since the beginning will be compatible 100% with your 6D.
Some mention mirrorless and it looks like it is the future and with the Canon system your lenses are 100% compatible with no loss of features no matter how old the lenses are, in fact the R system enhances the capabilities of the EF and EFs lenses that no other system can claim.
Your current lenses and camera are fully capable of the sharpness and crispness that you are desiring. As you know the aperture when stopped down too much causes a loss in crispness with diffraction, possible micro adjustment is needed, and other things not related to equipment like focus accuracy and steady holding which from your examples you seem to be aware of. (They actually look just fine for printing and framing). Remember that a 16x20 print is not to be seen with your nose touching the photo. Pixel peeping is for losers more concerned with such silliness vs actually looking at the photos in a real world way (NOT pixel peeping).
So yes, the 6D MII might give you some help in DOF etc. and go for it if it is in the budget.
Good luck.