You asked
Is the nikon af s 50mm f 1 4g good in low light?
Yes, for low light the Nikon AF-S 50mm f/1.4G is a strong choice. Its f/1.4 maximum aperture gathers far more light than any kit zoom, and it's a good match for dim rooms, indoor events and portraits. The lens isn't stabilised, so that wide opening is doing all the work.
On full frame it frames as a normal 50mm, and that's where I'd use it. The sensor guide says full frame earns its keep in low light, so I'd pair it with a Nikon D750, Nikon D850 or Nikon D6. On APS-C it frames like a 75mm and gives about the depth of field of f/2.1, so it still works there, just with less of that low-light edge.
If you're building a kit from scratch, the lens guide explains where a fast standard prime fits alongside a zoom.
Written by Claude from this site's pages.