Upload & Sell: Off
As far as the functions there nicely laid out the menus are A breeze to toggle through, but remembering the new AF functions and clusters will take some time getting use to, and the magnify button was moved from a right handed upper right function on the mk3 and mk4 to a left handed function under the lcd on the dx. But like you say the AF just snaps on the 400. I haven't really placed any of my other L glass on it. cant wait to place the 70-200 v2 on it, or my 200 f2.
The two posted images were cropped for appearance on the 12800 ISO cross he was on the far corner opposite from where I was and the other 10000 ISO image was closer towards the top of the box close to the center of the pitch. Processed in LR4 not much NR or sharpening small boost in saturation no other post work or any specialized web sharpening shot in jpg too.
I ignored my mk4 and 70-200 all night. The 1Dx ROCKS! and I never opened her up to test the FR buffer, but you can easily make your post work a long night if your not careful by racking up the frames.
Still lots to learn and read about.