Full Frame - meaning same sensor size as 35mm film camera image as opposed to "Crop Sensor" which applies to any sensor size smaller than FF.

Pixel count is not the only thing that effects IQ. Many factors should be considered when evaluating desirability of an upgrade.

There are utility programs that can be downloaded on the internet. The best one in my opinion is called "Digital Info" and it is free. You can use is as often as you want on as many Canon Cameras as you want. It doesn't work with all Canon cameras - some early models and some later models, but it works on this camera.

I am attaching an example of it's output.

Not an accurate way to get actual shutter count.

Another Troll that likes to shoot down other people. Makes them feel better and important - which they definitely are NOT!

There have been three versions of this lens:

1.) Had metal mount
2.) Same as 1 but plastic mount (the version being sold here. Since so small and light, plastic mount is plenty strong.)
3.) Has metal mount (again) and has the STM Focusing Motor.

Note: All three versions have identical optics

That's a crock. Warranties only protect an original purchaser, so Grey Market has absolutely no impact for someone buying second hand.

I think you have it backwards. With a FF at the same framing the camera would have to be closer to the subject and it seems to me would therefore have more perspective distortion. No??

Well, given your requirements as you state them, I would say a new camera would be a welcome improvement, so my advise is to buy a more capable new camera and possibly new glass as well. However, having said that, I believe a 6D MkII and 24-105 1:4L IS USM Lens is going way overboard for those requirements and a completely unnecessary expenditure. If the cost is not a consideration for you then I would certainly not discourage you, but you do not need to spend anywhere near that amount to more than satisfy your needs.

Therefore, my recommendation would be to go for something like a Canon EOS 750D/T6i which has a 24 Mp Sensor, and a 3" Articulated LCD as well as WIFI which would allow for Tethered use which you indicated might be a consideration for you. You might also pair that with any of the Canon EF-s STM Kit Zoom Lenses which would also provide IS for hand held shooting. Which STM Lens you selected would depend on what focal length range you feel would best suit your needs. The EF-s 18-55mm and/or 55-250mm for instance are superbly sharp lenses every bit as good optics as the L lens you mention. The only thing you would loose with the kit lenses is build quality, but the new STM Lenses are actually quite good in that regard while being lighter weight.

I suggest you Google these options and see what the expert reviewers have to say.

Good luck with your decisions.

Gimbals are ideal for large lenses that have a mounting foot attached to the lens but not so good for cameras with smaller lenses where the camera is attached to the head.

No, the batteries you have are Li-Ion and they have no memory problem unlike the old NiCad and to a lesser extent NiMh batteries. They there for require no deep discharge to prevent memory problems.

Define "minimal use".

Your wrong!!! Necessary converter readily available. Why do you insist on posting to so many threads you know nothing about???

I find it hard to believe "1 microsecond" duration LED Flashes. Your title mentions CCD's. CCD Digital Camera Sensors are not commonly used now days. As already asked, what do you mean by LCD (Liquid Crystal Display).

Yes!! The Canon EF-S 55-250mm f/4-5.6 IS STM is a very good highly regarded relatively inexpensive zoom lens. Much much better than the Canon EF-S 55-250mm f/4-5.6 IS II. Google it to get a lot of opinions of how good it is.