You asked
Is the canon rf 85mm f 1 4l vcm good in low light?
Yes, it's a strong choice for low light. Its f/1.4 maximum aperture lets in a lot of light, and as a prime it gathers far more than a kit zoom. The lenses guide explains why primes win in dim conditions. It works best on a full frame body, as the sensor guide explains.
The lens itself isn't stabilised, so in dim places you'll lean on that wide aperture and a fast shutter speed. For a low-light setup, I'd look at these bodies from its list:
If you mostly shoot people indoors, this is the lens I'd reach for first. Check out portraits for more on using an 85mm.
Written by Claude from this site's pages.