Although I've largely moved from Canon on Landscape and Architecture to the Sony A7R, the 7DII remains my favorite for Birds, Wildlife and Action. This is absolutely awesome when paired with the 100-400 Mk II or the 70-200L 2.8 IS.
Fast Focusing; Great Usability and Handling; the Camera for Birders; Wildlife and Sports - especially good with the new 100-400 Mk II
I would like a little better Dynamic Range; especially pulling up detail from dark feathers