I’ve been using the Canon EF 24-70mm f/2.8 L USM a lot at work lately and I’m in love with it. I get to use a pretty extensive range of high-end Canon lenses in my line of work and so far my favorite really is this wide-angle zoom. It’s so damn versatile and sharp and it goes just wide enough but without making me worry about extreme distortion. The lack of IS doesn’t even really bother me because of the 5D’s excellent noise reduction at high ISO (plus, Lightroom has excellent noise reduction tools too). Sure, it’s heavier than some other more popular Canon lenses, but the weight just makes this beast feel so solid. I’m looking to buy one. If you’ve got one you’d like to get rid of, I’d seriously consider it if you email me with details.