The key parameters for me are focus, frame rate, and buffer size. I want a camera that can lock on the focus quickly, and then let me lean on the shutter for long bursts without slowing down. Resolution is of lesser importance. In the Pantanal last September, I had a jaguar walking slowly along the riverbank towards our boat. I fired a burst that must have lasted for a full minute. Sure, I ended up with an enormous number of shots, but deleting later is easy. Switching to C-RAW has helped a lot with the R5 to increase the buffer size and card capacity without sacrificing quality. This shot was with the 1DX III.