This is a magical lens. HUGE, but magical. Why? Its as sharp as most of the EF L series lenses we saw and it is a zoom. INCREDIBLE image quality. Heavy. However, if you are a professional (think wedding) who relies on primes in the past, you might want to look at this. Over $3000, but justified if you are using to bring home the bacon, and want a lighter camera bag, instead of carrying several primes.