You asked
Is the canon eos r6 v good in low light?
The site doesn't give a low-light rating for the Canon EOS R6 V, so I can't say how it performs in the dark. What I can say is that it's a full frame body with in-body stabilisation. Full frame gathers about a stop more light than APS-C at the same framing and f-number, as what a bigger sensor buys you explains. The original Canon EOS R6 is described as excellent in low light, but that's a different camera.
For dim scenes, I'd pair the R6 V with a fast prime. The Canon RF 50mm f/1.8 STM is cheap and bright, and the Canon RF 85mm f/1.2L USM is the one to buy if money is no object. Primes or zooms covers the trade-off.
Written by Claude from this site's pages.