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Frankly, I don't think the size of the glass matters as much.. (quality of glass and sensor size matters more). For example, a 70-200 L glass from canon is 67mm while a shorter L glass is 77mm.
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True. Again it really depends on what you're sticking behind that glass, too. Smaller sensors mean the glass can be made smaller because you don't have to focus on as large an area. (For example on my Nikon D200, my 18-200 DX format lens would be much much bigger if it was to be made for 35mm).
I don't think you can go wrong by buying any of the "L" glass either.
You'll will usually find the better glass is "faster" which consequently makes the glass physically bigger though.