You asked
Canon rf 85mm f 1 2l usm vs zeiss otus ml 85mm f 1 4?
Both are 85mm lenses for full frame, so the choice comes down to autofocus and mount.
The Canon RF 85mm f/1.2L USM autofocuses and fits Canon RF cameras. If you shoot Canon full frame and want the wide aperture without fuss, it's the easy pick. Its f/1.2 is a little wider than the Zeiss's f/1.4, so it gives more background blur and more room in low light.
The Zeiss Otus ML 85mm f/1.4 is manual focus only. It fits Sony E, Canon RF and Nikon Z, so it's the one to consider if you use more than one system or are happy focusing by hand.
For portrait work, the 85mm is the classic choice, as the portraits guide explains. Pick the Canon for autofocus and the Zeiss if you'd rather focus manually.
Written by Claude from this site's pages.