Sigma 20mm f 1 4 dg dn art vs viltrox af 13mm f 1 4?

Here is what the site says about that.

From Sigma 20mm f/1.4 DG DN Art: Sigma 20mm f/1.4 DG DN Art: A prime lens by Sigma for Full frame cameras, 20mm f/1.4. Specs - Maker: Sigma - Focal length: 20mm (prime) - Maximum aperture: f/1.4 - Made for: Full frame sensors - Mounts: Sony E, L-Mount - Stabilised: no - Autofocus: yes What it frames like - On full frame (Sony E, L-Mount): as marked, 20mm. - On APS-C (Sony E, L-Mount): like 30mm on full frame; f/1.4 gives about the ...

From Viltrox AF 13mm f/1.4: Viltrox AF 13mm f/1.4: A prime lens by Viltrox for APS-C cameras, 13mm f/1.4. Specs - Maker: Viltrox - Focal length: 13mm (prime) - Maximum aperture: f/1.4 - Made for: APS-C sensors - Mounts: Fujifilm X, Sony E, Nikon Z - Stabilised: no - Autofocus: yes What it frames like - On APS-C (Fujifilm X, Sony E, Nikon Z): like 20mm on full frame; f/1.4 gives about the depth of field of f/2.1 there. ...

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