Bianchi wrote in post #19152454
Besides more FPS and advanced AF system, are you seeing about the same IQ from the 5D4 vs the R5?
A short answer:
Yes, about the same IQ, with the emphasis on about.
A longer answer:
When I decided to get the R5, my decision wasn't to replace the 5D IV but as a companion (not backup) body. As a person primarily interested in bird/wildlife photography, I went from 5D III -- which I loved -- to 5D IV some years ago not for better IQ but simply for better crop-ability. The end result for the move was more keepers, not better IQ. Likewise, with the R5, I didn't make the move for better IQ but for more keepers. Although I haven't had much time with the R5, I fully expect that I'd end up with more keepers than the move I had made from 5D III to 5D IV, not only because of even better crop-ability but because the R5 will allow me to capture those situations where I wasn't able to with either the 5D III or 5D IV. 5D IV frustrated me often in certain AF tracking situations, and I've lost too many great opportunities to count. I don't think of the R5 as the perfect camera, however, that would redress all of my past frustrations with the 5D IV. I know how to temper my expectations with realism, but given my initial experience with the R5, it's the best thing going for me right now.
Where the IQ question can come in is which lens that pairs up with the R5. I'm sure those long Canon primes would yield images with superior IQ than my R5 with Sigma 150-600C. For this reason, I've set my eyes on the expected RF 800 f/5.6 in the pipeline for 2021.