"My fast, ultra-wide. Used for unique getting-ready photos, wide shots of ceremony showcasing the venue, some formals, and crazy reception party shots. People will get drunk. It makes this lens even cooler."
"I own the first generation of this lens and firmly believe that something this long is required for most ceremonies, and if you want to make sure you can use it in almost any situation, go ahead and get the 2.8 IS... Otherwise you'll spend the money on a lesser lens and realize you need both the extra stops in aperture and the ability to drop your shutter speed with the IS."
"If you're shooting weddings, you need an external flash for the getting ready and reception shots. Compared to the 480EX II (which I have owned and subsequently sold), this is far superior. I own 4 of them; two for my 2 shooting bodies, and two to put on stands and cross light for dark receptions where I can't bounce. Which leads me to..."