Sigma 10-20mm f/3.5 EX DC HSM review

Does the Pentax fit include HSM and will this work with a Pentax K-7?

According to the Sigma US site, Pentax HSM 3.5 fit is available: http://www.sigmaphoto.com/shop/10-20mm-f35-ex-dc-hsm-sigma

After a weekend of comparison test shots in different contexts, I sold my Canon 10-22mm to buy this. It is an amazing and versatile piece of top-class glass. $ months on, no regrets!

does this work well on Canon 500D and 550D? I'm very interesting with this lens, instead of canon 10-22mm. but I have concern with the compatibility. thx alot.

I love my Sigma 10-20mm f/3.5 the barking mad distortion you get from it is awesome and exactly what I wanted. Can be a bit fuzzy at the edges but who cares the photos I get from it are fantastic.

does this lens give you a fisheye look, and at what setting? are all images on the fisheye look regardless of the mm setting? if at the 10mm setting you get the fish eye look, at what setting on the mm can you not get the fisheye look?