Originally posted by Damon anyone really think I shouldn't go with the sigma or have more suggestions?
The sigma 30mm f/1.4 is a capable lens, but its optical characteristics can be limiting on the kind of subjects you can photograph* - I prefer the FA31 because of its homogeneous distribution of sharpness and inherently high level of micro-contrast across the whole APS-C (and 35mm) frame - The sigma 30mm f/1.4 is extremely sharp in the centre, but that sharpness falls off towards the edges of the frame (even at f/11 the Sigma 30mm f/1.4 cannot match the sharpness of the FA31 at f/4 in the corners) and the sigma is a APS-C format specific prime lens with no aperture ring. I do a lot of studio work and when I'm working with flash having the aperture ring under your fingers is a real boon. The FA31 is also a brilliant lens to use on pentax full frame film cameras too**.
* I know there are those who are going to challenge my opinion, you know who you are. By now you should also know that I stand by my statements.
**And if Pentax ever comes out with a full frame digital camera I'm sure the FA31 will be spectacular on it as well.