Huh! Leaves out sports, wildlife and landscape guys. Probably wedding guys too.
I did write
on average. If one wants the best camera for a specific type of shooting, that's a different scenario. Each camera, almost without exception, has its own individual strengths and weaknesses.
I would expect when processing RAW images one would see some marginal benefit of extra resolution in the 5DSR shots, compared with the D810, but it's too small to be of significance in these Imaging Resource jpegs.
For me, the availability of good lenses which suit one's shooting style is just as important as the characteristics of the body that fits the lenses. I remember well my reasons for buying my first Nikon system. I found that one of my most frequently used lenses was the Sigma 15-30 with the Canon 5D. When reviews of the Nikkor 12-24/F2.8 first came out, it was so obvious that the Nikkor wide-angle zoom was in a different league to the Sigma 15-30, and so much sharper.
I couldn't resist buying one with adapter, for use on my 5D. It then was I experienced all the disadvantages of using an adapter with a lens that isn't designed for the body, and for me that loss of functionality detracted from the advantages of the lens, leaving me in a quandary.
I solved the problem by getting the new Nikon D700, which was such good value at the time, compared with the very expensive but ground-breaking Nikon D3 with almost identical performance. For quite a while I continued to use two systems, carrying two camera bodies with me whenever I travelled, with the D700 permanently attached to the Nikkor 14-24.
Even after later buying my second Nikon camera, the D7000, I still continued to use the Canon 50D with the Canon 100-400 whenever I needed that range, because the old Nikkor 80-400 was no better than the Canon zoom and arguably not as good, so I couldn't justify buying it, although I did eventually buy the updated Nikkor 80-400 which I now use with a Nikon D7100 body, making all my Canon lenses and bodies redundant, at least for my purposes which now tend to be less specialized and more general, preferring the convenience of zooms to the slightly sharper results from primes.