Knowing that the M5 is part of the Canon EOS system, has the same Dual Pixel sensor that I have experienced firsthand in both the 70D and 7D Mark II, has the Digic-7 processor, the AF system matching the D-SLR bodies, and many other features I want, has all been enough for me to have decided to buy. I am already familiar with the Canon EOS interface and enjoy it.
The lens Adaptor (Canon's usual good build quality) so I can mount my EF lenses arrived on Saturday and the M5 body will arrive on Monday. I don't need any of the EF-M lenses, I am buying the M5 as an additional body for my close-up work.
I will be posting M5 pics on my Flickr page during next week and will not be expecting them to be distinguishable from those taken on my 7D Mark II or previously owned 70D just as there is no distinguishable difference between my images from those two bodies.
I would add that I think it's the mounted lens rather than the body which will have the bigger influence on image quality if we are comparing the M5 results.
https://www.flickr.com/photos/114775606@N07/