to a 24-70 or 24-105 in a few months, but I can't go without a wide end. Excellent product marketing by Canon, though. They can magically make a $1,100 lens a $1,750 commitment!

I've never used the 10-22, but from reviews I've read, the Tokina is 90% as good, with the major drawback being slight barrel distortion compared to the Canon. Something you may not even notice.

if Sigma/Tamron/whoever put out a lens that was objectively better than Canon L glass, I would have no qualms with buying it.

But having owned one of Sigma's "best" lenses (which is still a great lens, btw), I'd rather pay the extra cash and get L-quality colors.