How do you like that 10-22? I debate getting the thing from time to time. Have a 15-85, but at the wide end it sometimes seems pretty soft in the corners.
I traded in my Tokina 11-16 F2.8 II for it. The Tokina was sharper. But I just couldn't get along with the flare that Tokina had. It was brilliant in low light and astro, but any time I used the sun, the flare was crazy. It drove me mad. I eventually switched to the 10-22. It's not the sharpest lens. But it handles flare very well. I have a lot of shots on the 10-22 at this point, and I've yet to find myself staring at a corner at 10mm and thinking "this is too soft." I'm way more concerned with distortion and stretching at 10mm, as it's quite present and way more noticeable to me than sharpness is. I generally shoot it at F8~F11. So far, I'm still happy with the swap. I really liked the Tokina. But, being able to shoot into the sun when I please is a big plus here in Florida.
Here's the 10-22 right into the sun on the same day as the previous shot posted.
Again, I've yet to be too concerned with corner sharpness at 10mm. Just looking at corners at 10mm, everything is stretched and distorted, lines become curves, so it's hard to really tell that something is noticeably softer in nature, rather than say... on a chart with lines and numbers. I have a lot of 10mm shots too.
Anyhow, here's an interesting comparison:
10-22 @ 22mm F11
IMAGE LINK: https://flic.kr/p/zt6TuE a130_proc by Martin Wise, on Flickr
22 F2 @ 22mm F11
IMAGE LINK: https://flic.kr/p/zt4XaE a112_proc by Martin Wise, on Flickr