It was interesting to say the least. Shot with both cameras set to the same settings with the 85mm f/1.2 and 24-70mm. The photos of the Mark III straight out of the camera were so much better than the II in terms of IQ, exposure, and color rendition. When some people say there's not much difference in IQ I have to say they're full of it. The handling of the Mark III just felt so much better and more substantial except for the new joystick on the new grip. It just felt awkward. It will take some time to get used to.