I can only second other posters praising this lens - I agree it has a prime-like quality both regarding colour rendering, micro-contrast and sharpness, the last especially in the wide end. And it is solidly built, compared to the other DA-lenses I have.
Ok.... My Mother just sent me a $1000.00 for working on the yard of her beach house,,, so If you had the money which lens would you get of the 3 Wide Zooms and Why?
I just picked up a used DA 12-24mm (and also a DA70) this morning . Here are two test photos I took before paying the previous owner. Both are at full aperture (F/4). JPEG files are directly from my K10D, no post-processing, only down-sized for posting. CA is there alright, but not excessive.
although the sigma 10-20 is my only non FF lens, it only vignetts at 13mm on my PZ-1.
I also hae retained mainly FF capability but not on the hope that pentax develops one, but because I have 3 film bodies,
Interesting.... most reports I've read say this lens vignettes at all FL and is one of the only lenses that does so wrt UWA lenses. I think I should pop it onto my Mz-5n to have a look.