One has to focus manually with the Leica 180/2.8 APO. And while that’s the rub, I tried yesterday at the zoo with focused-by-eye shots with the 180/2.8 APO on the Nikon D4, just to see if it could be done when things were not moving too fast.
I don’t have the Nikon AF-S 200mm f/2 VR II which is is far better suited to moving subjects (autofocus), but not in the same league across the frame as the Leica 180mm f/2.8 APO-Elmarit-R, which is plain to see from Nikon’s MTF chart if nothing else (and easily proven in the field as I did for myself some time ago).
The level of detail cries out for a D800E, if you ask me! While the Nikon D4 offers “only” 16 megapixels and that is enough for many things, why not have more than twice the pixels?