Leica super apo summicron sl 21mm f 2 asph vs panasonic lumix s 20mm f 2 5?

Here is what the site says about that.

From Leica Super-APO-Summicron-SL 21mm f/2 ASPH: Leica Super-APO-Summicron-SL 21mm f/2 ASPH: A prime lens by Leica for Full frame cameras, 21mm f/2. Specs - Maker: Leica - Focal length: 21mm (prime) - Maximum aperture: f/2 - Made for: Full frame sensors - Mounts: L-Mount - Stabilised: no - Autofocus: yes What it frames like - On full frame (L-Mount): as marked, 21mm. - On APS-C (L-Mount): like 32mm on full frame; f/2 gives about the depth of field of f/3 there. ...

From Panasonic Lumix S 20mm f/2.5: Panasonic Lumix S 20mm f/2.5: A prime lens by Panasonic for Full frame cameras, 20mm f/2.5. A small, light wide prime made to match the S9. Specs - Maker: Panasonic - Focal length: 20mm (prime) - Maximum aperture: f/2.5 - Made for: Full frame sensors - Mounts: L-Mount - Stabilised: no - Autofocus: yes What it frames like - On full frame (L-Mount): as marked, 20mm. - On APS-C (L-Mount): like 30mm on full frame; ...

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