6-10 years ago, I don't think anyone would argue that sigma and tamron were considered bargain, try at your own risk lenses. Since then, at least in my view, both made leaps and bounds in quality and now rival the pricey Nikon and Canon lenses. I think that now, a lot of the price in the, "premium brands" are for buying into the brand name and not necessarily the huge quality difference that the price would claim. If anyone has any scientific data on the quality of lenses in question and why there's such a price difference in seemingly similar lenses, I'd love to hear it.
Best,
James
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