You asked
Is the nikon af s 58mm f 1 4g good in low light?
Here is what the site says about that.
From Nikon AF-S 58mm f/1.4G: Nikon AF-S 58mm f/1.4G: A prime lens by Nikon for Full frame cameras, 58mm f/1.4. Specs - Maker: Nikon - Focal length: 58mm (prime) - Maximum aperture: f/1.4 - Made for: Full frame sensors - Mounts: Nikon F - Stabilised: no - Autofocus: yes What it frames like - On full frame (Nikon F): as marked, 58mm. - On APS-C (Nikon F): like 87mm on full frame; f/1.4 gives about the depth of field ...
From Sensor sizes: Is full frame worth it?: For low light, events, and portraits with very shallow depth of field, yes. For travel, street, wildlife on a budget, and most hobby photography, a good APS-C camera with good lenses is enough, and you'll carry it more. Lenses and light matter more than the last stop of sensor performance.
Quoted from this site's pages.