Studio scene of the R5 has been added.
Canon's EOS R5 mirrorless camera is the second-highest megapixel camera body the company has released, and now that we have a final model in our offices, we've set it up in front of our test scene to see what it can do.
www.dpreview.com
My conclusion - at base ISO, the 5DSR is still resolution king. However, the R5 is a close second, and looks (to my eyes) to be ever so slightly crisper than the R. That tells me the AA filter in the R5 may be a little bit weaker than the one in the R...but it is still a step down from the unfiltered 5DSR. Thankfully it is not a big one, though.
However - compare the R5 to the
standard 5DS (again, at base ISO), which is also filtered, and details in the R5 image appear to be better defined, even with the slightly lower resolution. Now, hard to tell how much of this is due to lens differences - I think at least some of it is explained that way - but the fact that the 5DSR remains the sharpest tells me that the R5 is somewhere in between those two cameras in resolving details.
Colors - YMMV on this one, since we all have different tastes. But to MY eyes, the R5 (or any of the R cameras for that matter) simply cannot measure up to the 5DS/R's OOC color palette. Like most of Canon's newer (post-2016) cameras, the R5 has the same dull, muted color output - particularly in the green-yellow spectrum.
High ISO - at 1600 ISO and higher, the R5 exhibits significantly less color noise than the 5DS/R. Could make a big difference with available light portrait shots, for example - as skin tones will remain even throughout. Although, once you get to 6400, both have reached the "point of no return" in my opinion...
Conclusion: I think as long as you stay at or below 800 ISO, I'd still pick the 5DSR if detail is the priority. So - studio, bright daylight, static scenes. Above that, the R5 images will clean up much nicer.