Squidy, I picked up the 24-105mm L for a T1i looking for the promised IQ boost (and AF boost). While we did get some sharp shots with it, in many situations I found I got a better image with my EF-S 18-55mm IS kit lens. Perhaps because I got a refurb body/kit and I lucked out on a well calibrated kit lens, but I was nearly always disappointed with the 24-105mm.
I may have got a bad copy of the 24-105mm, as everyone seems to love it, aside from me.
And I must have got an awesome kit lens, because everyone hates it, aside from me. I know the non-IS ones were crap, but *my* IS kit lens is just about as sharp as my primes and 70-300L. It just sucks for low-light, but so will the 24-105mm L.
I'm only repeating this story to point out that not every kits lens is equal, and not every L lens is equal. If the L lens isn't doing it for you, send it back. It's easier than trying to sell it a couple years from now.




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