After having this EOS R for a month I am selling it on as I really do not like it. It has some positives but its negatives far outweigh them, at least they do for me. It's not my cup of tea at all.
Lighter than my 1DX however most cameras are.
Lens AFMA is not required.
Inability to focus on certain subjects I guess due to few cross type focus points. As an example take a painting or photo in a frame on a wall. The EOS R will focus nicely on the vertical edges of the frame but completely fails on the horizontal edges.
EVF appears nice but whenever the shutter is half-pressed to focus the image seen in the EVF flashes brightly before settling down - very distracting.
The EF-EOS R adapter does not work well with 3rd party lenses at wide apertures - circle type vignetting appears as per the example attached and as I cannot afford the prices demanded for the majority of Canon RF lenses this anomaly is a big problem for me.
The new multi-function bar is awful as it is very easy to inadvertently touch with your thumb changing whatever settings its set for. I turned mine off.
IQ is not as good as it should be for a camera of this price.
For me, the overall feel/impression is like a compact camera than a DSLR. I shall be going back to a DSLR, probably a 5D mk iv.