You asked
Is the ttartisan 50mm f 1 4 asph good in low light?
Here is what the site says about that.
From TTArtisan 50mm f/1.4 ASPH: TTArtisan 50mm f/1.4 ASPH: A prime lens by TTArtisan for Full frame cameras, 50mm f/1.4. Specs - Maker: TTArtisan - Focal length: 50mm (prime) - Maximum aperture: f/1.4 - Made for: Full frame sensors - Mounts: Sony E, Nikon Z, Canon RF, L-Mount, Leica M - Stabilised: no - Autofocus: no, manual focus What it frames like - On full frame (Sony E, Nikon Z, Canon RF, L-Mount, Leica M): as marked, 50mm. - ...
From TTArtisan M 50mm f/0.95 ASPH: TTArtisan M 50mm f/0.95 ASPH: A prime lens by TTArtisan for Full frame cameras, 50mm f/0.9.
Quoted from this site's pages.