My wife was talking about wanting a faster lens than we currently own. So, I was able to find a GREAT deal on a Sigmalux. $444 shipped to my door.
Anyway, I didn't know whether to go with the Canon 1.4 or this lens. I have looked at reviews for both and a number of samples. It seemed it was a win-win.
However, with the Sigma being a 77mm lens (as ALL of my other lenses are), it seemed like a no brainer not having to buy more filters.
I own the Sigma 10-20 and absolutely LOVE that lens. The build quality is fantastic.
Also, they are extending their return policy (Abes Of Maine) to January 15th due to Xmas, so if I do not like it (rather the wife), then we can return it.
My only worry seems to be the possible front focusing problems that numerous people have talked about on the forum. I hope that my copy is as good as my Sigma 10-20 was.