sg! i just got that lens yesterday and tested it against the canon 10-22. it seemed to be on par for sharpness and quality so far and the perspectives you can have with it are pretty cool and for sure would make awesome photos. wide angle ftw
between canon and sigma ( i dunno if u have canon or nikon), the quality and sharpness was very close. i figured that for such a small diff in clarity, it didnt really merit me spending another 250-300 bucks extra.
quite happy with the sigma 10-20.