both video and photo pipeline is expeed. it does not go into DX mode for 11MP, its full sensor size. its unclear(atleast to me) if it does some form of line skipping or if its oversampled fully.

but the video mode supports full 8k60 atleast, so only a very tiny crop.

It's definitely not straightforward, there was no 8k originally AFAIK, that came through a firmware update and as far as I know is a totally different format that makes use of ticoRAW as a base (https://www.dpreview.com/news/9624409613/nikon-is-licensing-...), so RAW video isn't recorded in the same format as RAW photos (N-RAW vs NEF).

It can only do 8k60 though, not 8k120, so obviously the video pipeline and the C120 pipeline aren't identical.

When you say it doesn't go into DX mode for 11MP, you're correct for C120, but for C60 it /does/ go into DX mode (which captures a 19MP image). How this differs between C60 and C120, I'm not entirely sure in the camera internals. I had thought the resolution reduction is from cropping, but confirmed in the manual that when you enable C120, it's an 11MP photo but is full frame (no cropping).

Obviously this stuff is complex (maybe overly complex) and I haven't delved into it super deeply since I don't need it for my type of photography (and I never do video).