"It is extremely sharp and is definatly wide enough. This is a true wide angle lens." bhphotovideo.com
"I use this for spherical panoramic photos and it is the best lens for the job." bhphotovideo.com
"This is my first wide angle zoom and I don't see a reason to purchase another. Color and contrast are great, good edge to edge sharpness. Zoom ring is tight and well dampened." bhphotovideo.com