I've noted the posts in praise of the FA* 24mm. f2.0. I could use such a lens for indoor architecture.
According to Popular Photography's review (3/93) it is very sharp, but a bit weaker at f2 and 2.8. Moderate barrel distortion. Across most apertures, it consistently overexposes by about 1/3 EV. That is a nuisance for shooting slide film. The new Sigma 24 mm. f1.8 was reviewed in the 11/02 Pop Photo. It has less barrel distortion and less light fall-0ff. It tends slightly to underexpose, which is better for slide film. It is sharpest at f2.0, and second sharpest wide open. This is important for indoor use hand-held. They are close enough in price that cost is not a factor. I'm sure the Pentax will resist flare better, but as I said, this is mainly for indoor use. On the basis of these reviews, it sounds like the Sigma is a better lens for me. Please, someone give me a reason to buy the Pentax. Thanks, Joe
