I found something interesting while comparing the two cameras (Canon 5D Mark III and the Nikon D800) for my main review that I thought I would share before my review comes out.
Both cameras had the same settings, like 1/50th shutter speed. Both were set to the same frame rate of 24fps.
I noticed when punching in for a zoom on both cameras to get focus that the Nikon didn’t feel right to me, so I pointed at my ceiling fan and found some sort of frame rate or display refresh rate issue with the display on the back of the camera and on the monitor connected via HDMI.
This is a problem for me since I use the punch in feature a lot for focus, the Canon has such a nice image zoomed in but the Nikon feels very jittery and something can make it hard to get that critical focus. So in this test the clear winner is the Canon.