I recently bought the PENTAX SMC-FA 20-35mm f/4 AL and LOVE it. The
contrasty, full-frame sharpness, and distortion-free images have been
phenomenal. The lens also handles well, and is relatively small. Yeah, it's
f/4, but the one-stop loss vs. size is often handy.
It is, without a doubt, one of the nicer lenses I own (though I hear the 20mm
Pentax is sweet, too... probably even better.) I have run a ton of stuff
through this lens in the three months I have had it, and all the shots are
flawless. No flare, no soft edges.
If I had the cash and did it over again, I might also consider the 20mm
Pentax for the distortion-free wides, and then also get the Pentax F 17-28
fish for kicks. I hear it is a "fun" lens. Note, too, that if a 24 would do
the trick, the Pentax FA* 24 f/2 EDIF is killer.
As anyone who knows me knows, I am none often too hot on Sigma lenses. My
experiences have all been dismal. Soft edges, unsharp images all around. I DO
hear that the 14 is killer, though. Haven't used it myself. I'd look at a
Tokina, if any options exist, before Sigma.
Just my two cents.
Pete
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