You asked

Is the ttartisan 50mm f 1 2 good in low light?

Here is what the site says about that.

From TTArtisan 50mm f/1.2: TTArtisan 50mm f/1.2: A prime lens by TTArtisan for APS-C cameras, 50mm f/1.2. Specs - Maker: TTArtisan - Focal length: 50mm (prime) - Maximum aperture: f/1.2 - Made for: APS-C sensors - Mounts: Sony E, Fujifilm X, Nikon Z, Canon RF, L-Mount, Micro Four Thirds - Stabilised: no - Autofocus: no, manual focus What it frames like - On APS-C (Sony E, Fujifilm X, Nikon Z, L-Mount): like 75mm on full frame; f/1.2 ...

From Nikon Z 35mm f/1.2 S: Nikon Z 35mm f/1.2 S: A prime lens by Nikon for Full frame cameras, 35mm f/1.2. A large, very fast 35mm for low light and shallow focus.

Quoted from this site's pages.

From these pages