Is the leica summicron tl 23mm f 2 asph good in low light?

Here is what the site says about that.

From Leica Summicron-TL 23mm f/2 ASPH: Leica Summicron-TL 23mm f/2 ASPH: A prime lens by Leica for APS-C cameras, 23mm f/2. A 35mm-equivalent everyday lens. Specs - Maker: Leica - Focal length: 23mm (prime) - Maximum aperture: f/2 - Made for: APS-C sensors - Mounts: L-Mount - Stabilised: no - Autofocus: yes What it frames like - On APS-C (L-Mount): like 34mm on full frame; f/2 gives about the depth of field of f/3 there. - On the larger-sensor bodies of ...

From Leica Super-Vario-Elmar-TL 11-23mm f/3.5-4.5 ASPH: Leica Super-Vario-Elmar-TL 11-23mm f/3.5-4.5 ASPH: A zoom lens by Leica for APS-C cameras, 11-23mm f/3.5-4.5. Wide-angle zoom, about 17-35mm equivalent.

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