Following on from the good quality EF-S lenses discussion, I would like to see a decent compact ultra wide angle crop sensor prime. I doubt it will happen but the only Canon option is the 10-22 zoom, which I own, and like others here have said, especially used on a pixel dense sensor like the 7D, the resolution does drop off and become mushy towards the corners- especially when files are viewed close to 100%. Don't get me wrong, I think the 10-22 is a fine lens but may be due an update to keep it viable on the higher res sensors. A compact ultra wide crop lens would make a nice alternative- other than the horrendously expensive 14L which is mostly wasted on crop anyway Canon have no primes you could call truly ultra wide for crop. The recent IS primes (24,28 and 35) have gone some way to increase the choice of modern Canon standard-ish or moderately wide primes for crop and FF but are still expensive at the present time.