Canon ef 100mm f 2 usm vs sigma 105mm f 1 4 dg hsm art?

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From Sigma 105mm f/1.4 DG HSM Art: Sigma 105mm f/1.4 DG HSM Art: A prime lens by Sigma for Full frame cameras, 105mm f/1.4. A very large, very heavy portrait prime known for its background blur. Specs - Maker: Sigma - Focal length: 105mm (prime) - Maximum aperture: f/1.4 - Made for: Full frame sensors - Mounts: Canon EF, Nikon F, Sony E, L-Mount - Stabilised: no - Autofocus: yes What it frames like - On full frame (Canon EF, Nikon F, Sony ...

From Canon EF 100mm f/2 USM: Canon EF 100mm f/2 USM: A prime lens by Canon for Full frame cameras, 100mm f/2. Specs - Maker: Canon - Focal length: 100mm (prime) - Maximum aperture: f/2 - Made for: Full frame sensors - Mounts: Canon EF - Stabilised: no - Autofocus: yes What it frames like - On full frame (Canon EF): as marked, 100mm. - On APS-C (Canon) (Canon EF): like 160mm on full frame; f/2 gives about the depth of ...

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