Sigma 10 18mm f 2 8 dc dn contemporary vs sony e pz 10 20mm f 4 g?

Here is what the site says about that.

From Sigma 10-18mm f/2.8 DC DN Contemporary: Sigma 10-18mm f/2.8 DC DN Contemporary: A zoom lens by Sigma for APS-C cameras, 10-18mm f/2.8. Specs - Maker: Sigma - Focal length: 10-18mm (zoom) - Maximum aperture: f/2.8 - 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 15-27mm on full frame; f/2.8 gives about the depth of field of f/4.2 there. ...

From Sony E PZ 10-20mm f/4 G: Sony E PZ 10-20mm f/4 G: A zoom lens by Sony for APS-C cameras, 10-20mm f/4. Specs - Maker: Sony - Focal length: 10-20mm (zoom) - Maximum aperture: f/4 - Made for: APS-C sensors - Mounts: Sony E - Stabilised: no - Autofocus: yes What it frames like - On APS-C (Sony E): like 15-30mm on full frame; f/4 gives about the depth of field of f/6 there. - On the larger-sensor bodies of Sony E: ...

Quoted from this site's pages.