D3 AF is wonderful for two reasons....
Both of these are with the 70-200mm with TC-17E II attached.
It can nail the focus on a small bird on a branch on a very windy day (this is 1/6th of the frame):
and it can nail the focus on a dog running fast towards the camera (this was the first and only shot as I aimed the camera at the dog):
I also think that the AutoWB is better after the recent firmware upgrade.