Couple from the past few days.
One is a basic ergonomics factor. On most of the Canon dSLR's, on the front of the body, between the viewfinder "hump" and the right grip with the shutter button, there is a ridge that makes putting the camera down secure and easy. The EOS R is just smooth and flush between the viewfinder and the grip, meaning my index finger doesn't have that ridge for a positive grip when putting the camera down in, say, the center console of my truck...or really any other surface with one hand. This matters most with a heavy lens attached.
I really hope the next R gets that ridge back.
Another quirk, that some might call a quibble, is the
AF point types. I "discovered" by accident yesterday that they are all horizontal AF point types--no verticals, no cross-types. (I was, believe it or not, taking photos of some window blinds with cool light and shadow patterns.) Canon addresses this here:
Canon's new EOS R full-frame mirrorless camera has stirred a lot of buzz, and I'm sure readers will have as many questions as we've had about it. I had a chance to sit down with a panel of top Canon engineers at the…
www.imaging-resource.com
We also learn from the linked article that Nikon went the same way with AF point-types, just using less for some reason. Clearly not a firmware issue.
I'm working around it just as the article suggests, by slightly tilting the camera to one side or the other for a moment to lock focus. And I've already posted elsewhere that for portraiture, the R's AF system is the best I've ever used.
This does, however, explain some frustrating moments in the past week where the camera just hunted (landscapes and still lifes).
Finally, and this is a quibble that might really be a quirk, already discussed a bit here on CR: The IS stays on. But I think I can go a step further and say it is staying on EVEN WHEN THE LENS'S IS SWITCH IS OFF! I say this because I can hear it if I place my ear against the barrel. (I found some suggestions somewhere on the web that the IS disengages with the switch off, but the unit remains energized. Could this just be to have it ready? To protect it from bumps when the camera is in use without IS on?)
It would be very interesting to hear Canon's explanation!