Been a Canon shooter a long time. In recent years I’ve shot with the 7DII, 80D, and 5DIV coupled mostly with the 100-400L II or 400 DO II.
Then came the R5 and a short time later the RF 100-500. I birded happily with that combo for over a year but as expected, had to do extensive cropping.
A couple months ago I was lucky to pick up an R7 body at a local camera shop. Since then, my other gear is getting a rest. The R7 provides superb detail and works great with the RF 100-500. The button/dial lay out on the back only took a few days to get used to. I find the combo to be a light weight, nimble and powerful photographic tool.
When I think back to my Minolta SRT 101, I cannot believe the technological advances!
Just my 2 cents.
Do I like the R7 for bird photography----NO
First problem--The undamped mechanical shutter. This is OK with single shot drive mode if EFCS is used. But with H+, H or even sometimes with medium speed drive mode shutter shock starts to rear its ugly head. Not on every shot but enough to cause me to lose confidence in the camera. The problem can be reduced if a fast shutter speed is used, there is no magic number but faster than 1/500 is usually OK on my tests. This is OK for BIF but not for perched birds where I often want a slower shutter speed.
Second problem-- huge distortion ("rolling shutter effect" ) with camera or subject movement when the electronic shutter is used. This is especially obvious with the wings of little birds which flap very fast.
Third problem-- This one is a bit more subtle but has been reported and discussed on this forum. This is wandering focus when using AF Servo even when the subject is fairly still, such as a perched bird.
The R5 does not have these problems. I just select EFCS and leave it on for everything.
Maybe some might think it unfair to compare a camera (R7)with one costing more than twice as much (R5) and I take that point.
However if Canon would release a version of the R7 with a damped shutter like that on the R5 (and I think the R6) this would make it a much more appealing proposition. Yes it would cost a bit more, so be it.
Andrew