Summary: This lens is just amazing in every way. I bought mine used in excellent condition and it is sharp, fast focusing and has lovely contrast. The bokeh is nice, too. You will get some distortion at 17mm, as can be expected, but it is easily corrected in editing.
Summary: Love this lens, I do (unprofessional but I like to think of them as professional) landscape photos. I am very new and this lens allows me to seem like I've been taking photos for a long time. Couldn't ask for a better starter lens!!!
Summary: This is a fine wide-angle lens that does not get enough publicity or does not receive the requisite popularity it deserves. You always hear about the 14-24mm, the 24-70mm, and even the 16-35mm as the best choices for ultra-wide to medium-wide angle shots.
Excerpt: I was able to find this lens used at a substantial discount. However, it was in excellent shape. This lens is on my camera 50% of the time and my 70-200 VRII the other 50%. You will not be disappointed.
Pros: Consistent Output, Fast / accurate auto-focus, Nice Bokeh