I'm actually in the process of selling my 24-70 2.8L in hope of buying the 17-55. The L lens is an awesome lens, but I just felt like the 17-55mm is a better lens for my needs.
I find myself doing a lot of wide angle shots in crappy lighting with no tripod. Beyond that, my camera gets most of its use during travel so I find the smaller size and lighter weight to be a huge plus.
And maybe it's stupid, but going back to the travel thing, I find not having a red ring advertising the $1k+ price tag of my lens to be a plus...
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'member dat?
True dat.