You asked
Is the sony fe 50mm f 1 4 gm good in low light?
Yes, on a full frame body it's a strong choice for low light. At f/1.4 it gathers far more light than any kit zoom, and our lens guide makes the same point about primes. Pair it with a full frame camera that matches. Our sensor guide says full frame earns its keep in low light, events, and portraits.
Keep in mind that this lens has no stabilisation, so in dim rooms you'll need a shutter speed around 1/60 second or faster, or a higher ISO, to keep shots sharp. If you want even more light and can accept the extra cost and size, the Sony FE 50mm f/1.2 GM is the other option in this range.
Written by Claude from this site's pages.