"Solidly built and love the feel of finely machined parts. Very sharp corner to corner and has sharper contrast and colors than my other 12-24mm lens." bhphotovideo.com
"Purchased this lens almost as soon as it came out and it is an improvement over my 17-35. I do not miss the one stop while on the tripod. The quality is excellent so I do not feel as though I have really lost anything there either." bhphotovideo.com