You have had a plethora of suggestions, however one that has been overlooked is Craig's List. I have bought and sold on that forum 'with some precautions' and done very well. The system I use is;

1. Always talk to the prospective buyer/seller on the phone to qualify them as being serious. Forget emails and texting. When I buy or sell I email them my phone #, and if/when they call they are most often interested and a serious prospect.

2. I always meet in the lobby of my bank, (mine has branches all over the state) for security and if I decide to purchase I withdraw the funds, or selling I deposit the money immediately and am not walking around with a pocket full of cash.

3. If they don't agree to my terms of purchase/sale I say bye bye!

I have made some excellent purchases and sales on CL and the beauty of it is you meet in a safe place with security and the prospective buyer/seller can hands on evaluate the item. It is a cash only deal eliminating shipping and tax issues.

Just my opinion and experience and best of luck in your endeavor.
Michael

You could not swap me, even swap no money, an 850 for my 750.

It's not the features or the resolution. It's the camera I prefer. No
lab test, no mixed up replies on the forum, can substitute for your
personal preferences. And you can't depend on the preferences of
other users' even if they'd tried one of that pair but then switched
to the other, even if they shoot the same stuff as you.

So I can't tell you you would prefer one or the other. And since no
one else can either, I can only point out that all cameras today are
far more capable than they need to be ... often more capable than
the users, so don't overspend. Hey, if you don't need the tilt screen
cuz you never use live view, you can even step down from the 750,
cuz they're almost giving away 610s lately :-)


`

decided to move from a fuji s-x1 super zoom to a "real" camera system.after lot's of research,opted for olympus e-m1 system.not even the mII model.took the plunge by buying everything used.made sure the bodies had the lowest shutter count I could find.first body had 1050 on the shutter.came with a 14-45 f3.5,a 45-150 f4.combo.Cost? 500.00.absolutely love it.upgraded the lens to a 14-150 f4.This combo is water resistant .second body had shutter count of 130.put hdl battery grips on both.put a panasonic 100-300 on the second body.with both lenses I can cover 28-600mm.will soon upgrade to the pana 100-400 for a bit more reach. finaly ,a 60mm oly macro lens. this thing is awesome.All these toys were purchased used,all have performed flawlessly. Total expenditure?$1600.00.every dollar well spent.will I upgrade to the mII body for 2 grand?Not for a long time.love what I have,does what Iwant and more.Good luck in making your choices.

Dear Diaper Troll - My response was not in any way, shape or fashion rude. After you finish kindergarten and move from cloth books with pictures to a book with actual words, you may note that the OP’s actual question as it was worded had to do with lenses not cameras. But he was comparing Apples to Giraffes - a normal/wide fixed aperture lens vs a fixed aperture zoom. Decidedly not the same thing except that the barrels of both are round. I have owned mirrorless cameras (Fuji and Olympus) with both of these lens types. Consequently, I felt jusified in raising a question to clarify what the OP was trying to say. Thanks for your input, pal, but, respectfully you are wrong.

There is the internet comparison of the Fuji X-T2 and the Olympus E-M1 mrII (and more than one exist). And there is the comparison that tdekany mentioned. Each body has it pros and cons. Both companies produce great lenses with the Olympus bring out their new Pro 25mm f1.2 that is really fast and really sharp. There are already UHH members that have shown 30X40 wall prints that some people viewing them refused to believe they were from a 4/3rds camera. Like Burkphoto mentioned, "Pick what seems to fit most of YOUR needs." For a lot of us, 4/3rds is smaller, lighter, and less costly versus a slight increase in noise at high ISO and extra DOF compared to the same f-stop of larger sensors (harder to blur the background). Would you be able to see the difference? In most cases, you will not be able to see the differences.