You asked
What is the canon rf 85mm f 1 4l vcm good for?
The Canon RF 85mm f/1.4L VCM is a portrait lens. On full frame it gives the classic 85mm view, with soft backgrounds and a comfortable working distance. It's lighter than the f/1.2L, and Canon built it with video in mind. It has autofocus but no stabilisation, so it relies on the camera body if you need that.
It fits a wide range of Canon RF bodies, including the full-frame EOS R5, R6 and R6 Mark II. On APS-C it frames like about 136mm, which makes it a tight choice for headshots and distant subjects.
If you're deciding whether an 85mm suits you, read Portraits first. For a cheaper start on people, the 50mm f/1.8 is my pick.
Written by Claude from this site's pages.