Panasonic lumix s pro 50mm f 1 4 vs sigma 50mm f 1 4 dg hsm art?

Here is what the site says about that.

From Panasonic Lumix S Pro 50mm f/1.4: Panasonic Lumix S Pro 50mm f/1.4: A prime lens by Panasonic for Full frame cameras, 50mm f/1.4. Specs - Maker: Panasonic - Focal length: 50mm (prime) - Maximum aperture: f/1.4 - Made for: Full frame sensors - Mounts: L-Mount - Stabilised: no - Autofocus: yes What it frames like - On full frame (L-Mount): as marked, 50mm. - On APS-C (L-Mount): like 75mm on full frame; f/1.4 gives about the depth of field of f/2.1 there. ...

From Sigma 50mm f/1.4 DG HSM Art: Sigma 50mm f/1.4 DG HSM Art: A prime lens by Sigma for Full frame cameras, 50mm f/1.4. Specs - Maker: Sigma - Focal length: 50mm (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, 50mm. - On APS-C (Nikon F, Sony E, ...

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