the Canon 10-22 is likely the best ef-s lens they have made... even though one it was one of the first ..... solid, sharp...accurate, repeatable focus
when I left the crop world, I sold mine for more than I paid for it.....
I had sold all the other consumer lenses.. but the 10-22 stayed on my 50D for a while....
the 16-35 II on a 5D II was a little better....
but the 10-22 is the best Canon wide for the 1.6 crop cameras
I loved mine
As far as I am concerned it should be the kit lens for the more expensive crop cameras ...
because wide is so hard to come by for them.