It is never a good idea to say that the mega-pixel war is over, but it looks like we are having a rest at around 40-50 MP with most pro cameras providing enough resolution. So why would one camera is better than the other?
Actually, once we remove the ‘how does it feel for you‘ argument, I am not sure any “same-level” camera is that much better than the other. With that in mind, the team from Fstoppers took three cameras to the test: The Sony a7RII, The Canon EOS 5DS R and the Nikon D810.
The cameras were tested for Dynamic Range, LOW ISO, Auto Focus accuracy, Slow-mo, and resolution. Some of the tests were more accurate than others, but nonetheless they provide plenty of material and arguing points if you want to start a brand war.
If you are the pixelpeeper king of photographer, you can download full res files here. If not, you may want to watch the review for its entertainment value, which it has plenty of.