I have just updated my Canon 5D Mk II to a 5D Mk IV. I am still learning all the new options especially the Auto Focus. My first impressions are that it will be a real time saver when it comes to photographing anything that is in motion, especially wildlife.
I have already customised it three times, but I think I have it fine tuned for me.
The really impressive difference for me is that I can auto focus with my 100 to 400mm Mk 1 plus x1.4 extender and it tracks quickly.
Time to try it for real