The 17-55 f/2.8 IS is as good as any L lens and I'm comparing it with my 100mmL macro IS, 70-200L and 10-400L.
I would agree with postcardcv that the missing 15mm is not worth worrying about.
The 70-200 f/2.8 is a stunning lens, but I find it's the least used on my 7D, as I use mainly the 17-55 and 100-400 plus the 100mm macro.
Harry
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