Kymarto, thanks for the insight! I didn't even know about the Sigma UWA until you mentioned it in a previous post. Since then I've been going back and fourth between the Sigma and the Tokina. I don't do a lot of shooting into the sun, so that probably isn't a huge consideration for me. Also, CA can be fixed in PP, so that's not a huge concern for me either. So for me, the decision comes down to 1) cost and 2) whether I would rather have f2.8 (which would have come in handy yesterday when I was taking pictures inside an old Spanish church where lighting was poor) or, would I rather have the extra 3mm (which, in looking at your example, is pretty impressive). I also like the fact you can use manual focus on the Sigma while in AF mode. I think the edge goes to the Sigma, all else considered, but then it's $125 more than the Tokina. I can see where both would be better in different situations. If the Sigma was also f2.8 it would be a much easier decision.