mr.izo: i think main question will be, how does this lense compare to let say sigma 12-24, i guess (which can be pretty good to excellent, when you get good sample).would be nice to see some test done head to hed, regarding sharpness (specially corners), filed curvature, flare resistance etc. because price different is huge.
I had 2 Sigma 12-24's. They are both gone and neither can hold a candle to the EF 11-24 I have now. Hands down an amazing lens. you have to shoot it to believe it.