I have a really bad itch to pick up a UWA lens. I've been looking at the Nikon 12-24 f/4, but the Tokina 11-16mm f/2.8 seems to be better in every way, and even if Nikon brings out a comparable lens as fast as the Tokina, its likely going to be at least double the price. With that said, this is going to be my first non-Nikon glass. I've shot with a couple borrowed Sigmas and Tamrons, but never owned any due to just splurging a bit more for the Nikon glass. I've read plenty of horror stories of bad Siggy's and other 3rd party lenses. Anyone really unhappy with this Tokina? I know this a is relatively lens, and there hasn't been a ton released, but I have not heard of anyone receiving a bad copy.