Is the leica super apo summicron sl 21mm f 2 asph good on aps c?

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 Sensor sizes: What a bigger sensor buys you: - Better low light. At the same framing and the same f-number, a bigger sensor collects more light in total, so images are cleaner at high ISO. Roughly, full frame has about one stop of advantage over APS-C, and two over Micro Four Thirds. - Shallower depth of field. At the same framing and f-number, a bigger sensor gives more background blur. An f/1.8 lens on APS-C gives about the ...

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