Leica elmarit tl 18mm f 2 8 asph vs sigma 23mm f 1 4 dc dn contemporary?

Here is what the site says about that.

From Leica Elmarit-TL 18mm f/2.8 ASPH: Leica Elmarit-TL 18mm f/2.8 ASPH: A prime lens by Leica for APS-C cameras, 18mm f/2.8. A pancake, about 27mm equivalent. Specs - Maker: Leica - Focal length: 18mm (prime) - Maximum aperture: f/2.8 - Made for: APS-C sensors - Mounts: L-Mount - Stabilised: no - Autofocus: yes What it frames like - On APS-C (L-Mount): like 27mm on full frame; f/2.8 gives about the depth of field of f/4.2 there. - On the larger-sensor bodies ...

From Sigma 23mm f/1.4 DC DN Contemporary: Sigma 23mm f/1.4 DC DN Contemporary: A prime lens by Sigma for APS-C cameras, 23mm f/1.4. Specs - Maker: Sigma - Focal length: 23mm (prime) - Maximum aperture: f/1.4 - Made for: APS-C sensors - Mounts: Sony E, Fujifilm X, L-Mount, Canon RF - Stabilised: no - Autofocus: yes What it frames like - On APS-C (Sony E, Fujifilm X, L-Mount): like 34mm on full frame; f/1.4 gives about the depth of field of f/2.1 there. ...

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