The feature that most impressed me has to be the focus tracking. I wouldn’t exaggerate when I say that the focus tracking is at least 70% better than the 1DX. The tracking seems to grab the subject and just doesn’t let go! Due to the operators error, I did miss a few shots but it was far less than I am used to.
I can also boast about the fact that the focus point is lit up again, as was the case with the 1D MkIV which makes it even easier to hit a moving subject.