You may get all sorts of answers. I use the Sigma 70-200 2.8 for a lot of my glamour work and it appears to be the full equal of the Canon L lens and independent reviews seem to confirm that. But suppose the OEM lens are better than the Sigmas or Tokina, etc. The question is how much better and is the "how much better" worth the price difference. I generally see only 5% or less difference between the best end results between the lens. Is 5% better worth 50% higher price or more?
Cheers,
rfs
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