Sigma 40mm f 1 4 dg hsm art vs ttartisan af 40mm f 2?

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From Sigma 40mm f/1.4 DG HSM Art: Sigma 40mm f/1.4 DG HSM Art: A prime lens by Sigma for Full frame cameras, 40mm f/1.4. Specs - Maker: Sigma - Focal length: 40mm (prime) - Maximum aperture: f/1.4 - Made for: Full frame sensors - Mounts: Canon EF, Nikon F, Sony E, L-Mount - Stabilised: no - Autofocus: yes What it frames like - On full frame (Canon EF, Nikon F, Sony E, L-Mount): as marked, 40mm. - On APS-C (Nikon F, Sony E, ...

From TTArtisan AF 40mm f/2: TTArtisan AF 40mm f/2: A prime lens by TTArtisan for Full frame cameras, 40mm f/2. Specs - Maker: TTArtisan - Focal length: 40mm (prime) - Maximum aperture: f/2 - Made for: Full frame sensors - Mounts: Sony E, Nikon Z, L-Mount - Stabilised: no - Autofocus: yes What it frames like - On full frame (Sony E, Nikon Z, L-Mount): as marked, 40mm. - On APS-C (Sony E, Nikon Z, L-Mount): like 60mm on ...

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