Originally posted by Conqueror The Sigma may have some numbers on the FA 31 - but when you experience the rendering/output of the FA 31mm you won't look back. It's also a nice lens to handle... To me the sigma produces a more clinical looking rendering. I also prefer Pentax colours... (A lot of this paragraph is subjective YMMV)
I don't mind the Sigma's handling. It's a bit on the heavy side, for sure, but it's right at that limit of unreasonable. I never feel tired carrying it.
The Sigma's rendering seems to depend a lot on the shooting conditions. Sometimes, it blurs wonderfully. Other times...not so much. As for the colors, they're very "digital"--very bold, punchy, and clean. It's a definitive look. The sharpness...wow. It's hyperreal. I have 20/15 vision and what the camera captures blows away what my eyes can see.
I also have FA77 and it has a dreamy type rendering. I think the FA31 is similar. I will pick up the FA31 at some point too. I want to try some portraiture with it.