Pentax hd fa 35mm f 2 vs sigma 35mm f 1 4 dg hsm art?

Here is what the site says about that.

From Sigma 35mm f/1.4 DG HSM Art: Sigma 35mm f/1.4 DG HSM Art: A prime lens by Sigma for Full frame cameras, 35mm f/1.4. The 2012 lens that started Sigma's Art line; common and cheap used. Specs - Maker: Sigma - Focal length: 35mm (prime) - Maximum aperture: f/1.4 - Made for: Full frame sensors - Mounts: Canon EF, Nikon F, Pentax K, Sony E, L-Mount - Stabilised: no - Autofocus: yes What it frames like - On full frame (Canon EF, Nikon ...

From Pentax HD FA 35mm f/2: Pentax HD FA 35mm f/2: A prime lens by Pentax for Full frame cameras, 35mm f/2. Specs - Maker: Pentax - Focal length: 35mm (prime) - Maximum aperture: f/2 - Made for: Full frame sensors - Mounts: Pentax K - Stabilised: no - Autofocus: yes What it frames like - On full frame (Pentax K): as marked, 35mm. - On APS-C (Pentax K): like 52mm on full frame; f/2 gives about the depth of field ...

Quoted from this site's pages.