Voigtl nder ultra wide heliar 12mm f 5 6 aspherical iii vs laowa 12mm f 2 8 zero d?

Here is what the site says about that.

From Voigtländer Ultra Wide-Heliar 12mm f/5.6 Aspherical III: Voigtländer Ultra Wide-Heliar 12mm f/5.6 Aspherical III: A prime lens by Voigtländer for Full frame cameras, 12mm f/5.6. Discontinued, but common used. Specs - Maker: Voigtländer - Focal length: 12mm (prime) - Maximum aperture: f/5.6 - Made for: Full frame sensors - Mounts: Sony E, Leica M - Stabilised: no - Autofocus: no, manual focus What it frames like - On full frame (Sony E, Leica M): as marked, 12mm. - On APS-C (Sony E): like 18mm ...

From Laowa 12mm f/2.8 Zero-D: Laowa 12mm f/2.8 Zero-D: A prime lens by Laowa for Full frame cameras, 12mm f/2.8. Specs - Maker: Laowa - Focal length: 12mm (prime) - Maximum aperture: f/2.8 - Made for: Full frame sensors - Mounts: Sony E, Nikon Z, Canon RF, Canon EF, Nikon F, Pentax K - Stabilised: no - Autofocus: no, manual focus What it frames like - On full frame (Sony E, Nikon Z, Canon RF, Canon EF, Nikon F, ...

Quoted from this site's pages.