canon/sigma difference
hi everyone, i currently have 350d, the kit lens (which i find ok) and a chocolate sigma 70-30 DG macro, im looking to sell this and upgrade to a canon 70-300 is usm. my question is, is it worth the change of lens, is the canon really that much better? thanks in advance,
Horse
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Weapons of choice,
Panasonic FZ8,
Canon 350d,Sigma 70-300 DG Macro
Serious? Me? Not in this lifetime....... 
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