Samyang af 18mm f 2 8 fe vs viltrox af 20mm f 2 8 air?

Here is what the site says about that.

From Samyang AF 18mm f/2.8 FE: Samyang AF 18mm f/2.8 FE: A prime lens by Samyang for Full frame cameras, 18mm f/2.8. Specs - Maker: Samyang - Focal length: 18mm (prime) - Maximum aperture: f/2.8 - Made for: Full frame sensors - Mounts: Sony E - Stabilised: no - Autofocus: yes What it frames like - On full frame (Sony E): as marked, 18mm. - On APS-C (Sony E): like 27mm on full frame; f/2.8 gives about the depth of field ...

From Viltrox AF 20mm f/2.8 Air: Viltrox AF 20mm f/2.8 Air: A prime lens by Viltrox for Full frame cameras, 20mm f/2.8. Specs - Maker: Viltrox - Focal length: 20mm (prime) - Maximum aperture: f/2.8 - 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, 20mm. - On APS-C (Sony E, Nikon Z, L-Mount): like 30mm on ...

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