Excerpt: This lens has been a life saver on more than one occasion. It allows me to get a lot closer to my subject than my other lenses, which is necessary for some of my shoots. The bokeh is nice and the stabilization is great to have as well. It's one of my favorite lenses.
Summary: Super sharp, small, and with IS!!! This lens is great for so many purposes. I used it on a crop sensor Canon Rebel camera, and it was plenty wide enough for most uses. I'm not a fan of ultra-wide perspective, and for me, this focal length is just about as wide as I'd ever want to go (in most situations). Great walk-around lens for travel, street photography, etc. Nothing bad to say about this lens. The build quality is excellent.
Summary: I adore this little lens. As others have already stated, it's sharp and renders colors beautifully. I've had the opportunity to use it in a few weddings, maternity shoots, and corporate events - photos of venues, large groups of people, and environmental portraits were all taken with this lens. The minimum focus distance is pretty small, so you can also take some interesting up close detail shots as well, though they won't be macro lens-level of detail, of course.
Summary: I upgraded from the older Canon EF 24mm. I have informally "tested" them side by side. This newer version is sharper with better contrast and color at all apertures in all areas of the field on a full frame camera. The stabilizer is handy and focusing is quick and near silent. Thanks Canon--and Amazon! I will use this lens mostly for landscape duties at medium apertures. There is a respected lens testing website that shows this lens as good but "not tack sharp".
Excerpt: Love this lens! I often shoot Holiday events and it's great for small groups or individuals up close. Sharp, light weight, non-intrusive, and fast focus. I previously used a 50mm and 70-200 but this lens allows me to mingle in the party and still get full length photos with surrounding atmosphere, or step up close.
Pros: Fast / accurate auto-focus, Lightweight, Strong Construction
Excerpt: One, if not the sharpest lens in my bag.It's very light and quiet and only shows a little bit of a vignette effect when used totally wide open (f/2.8) - nothing that cannot be fixed in post. Lightroom already comes with the profile for this lens and corrects everything nicely. IS is cool when using the lens for video.
Pros: Fast / accurate auto-focus, Lightweight, Nice Bokeh
Excerpt: Five stars from me for this lens for sharpness, speed, and image stabilizing. I bought this lens primarily for crowd shots and large group shots. However, it's also great for street photography: It's not intimidating and enables one to capture the subject's surroundings very well, which helps to tell the story. It's very lightweight, so you could shoot all day and not tire. It's made of metal where it counts and is undeniably superior to the 50mm 1.8.
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Lightweight, Strong Construction