I to have been looking for a wide angle lens for my 60d.
I keep going back and forth between the 10-22mm and the 16-35 2.8.!i rented both last dec. but after looking at some of those pictures I found most of them where not that sharp. Most where indoors @ 2.8. Maybe I need to learn that lens more.
What I want is a good sharp lens and low light capable ie 2.8. I really like the rumor of a 14-24mm. Is that rumor still valid?
Usually, its a case of fine tuning a lens using AFMA. The 60D does not have AFMA, which is why I don't recommend spending a ton of money on a very expensive lens and maybe not getting as sharp of images as its capable of.
Its generally easy to determine, put the camera on a tripod in liveview and use the live focus (contrast detect. If its not sharp, its a lens issue, or you are using the lens at maximum aperture where a sharpness falloff is normal.
There is no reliable rumor for a Canon 14-24mm lens, just made up ones that people want to believe in