7artisans m 28mm f 1 4 vs leica summicron m 28mm f 2 asph?

Here is what the site says about that.

From Leica Summicron-M 28mm f/2 ASPH: Leica Summicron-M 28mm f/2 ASPH: A prime lens by Leica for Full frame cameras, 28mm f/2. Specs - Maker: Leica - Focal length: 28mm (prime) - Maximum aperture: f/2 - Made for: Full frame sensors - Mounts: Leica M - Stabilised: no - Autofocus: no, manual focus What it frames like - On full frame (Leica M): as marked, 28mm. Cameras it fits - Leica M9: Full frame - Leica M9-P: Full frame - [Leica ...

From 7Artisans M 28mm f/1.4: 7Artisans M 28mm f/1.4: A prime lens by 7Artisans for Full frame cameras, 28mm f/1.4. Specs - Maker: 7Artisans - Focal length: 28mm (prime) - Maximum aperture: f/1.4 - Made for: Full frame sensors - Mounts: Leica M - Stabilised: no - Autofocus: no, manual focus What it frames like - On full frame (Leica M): as marked, 28mm. Cameras it fits - Leica M9: Full frame - Leica M9-P: Full frame - [Leica ...

Quoted from this site's pages.