Pentax hd fa 43mm f 1 9 limited vs sigma 30mm f 1 4 dc hsm art?

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From Pentax HD FA 43mm f/1.9 Limited: Pentax HD FA 43mm f/1.9 Limited: A prime lens by Pentax for Full frame cameras, 43mm f/1.9. Same optics as the earlier smc FA 43mm Limited. Specs - Maker: Pentax - Focal length: 43mm (prime) - Maximum aperture: f/1.9 - Made for: Full frame sensors - Mounts: Pentax K - Stabilised: no - Autofocus: yes What it frames like - On full frame (Pentax K): as marked, 43mm. - On APS-C (Pentax K): like 64mm on ...

From Sigma 30mm f/1.4 DC HSM Art: Sigma 30mm f/1.4 DC HSM Art: A prime lens by Sigma for APS-C cameras, 30mm f/1.4. Specs - Maker: Sigma - Focal length: 30mm (prime) - Maximum aperture: f/1.4 - Made for: APS-C sensors - Mounts: Canon EF, Nikon F, Pentax K - Stabilised: no - Autofocus: yes What it frames like - On APS-C (Nikon F, Pentax K): like 45mm on full frame; f/1.4 gives about the depth of field of f/2.1 there. - On ...

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