I am surprised that no one mentioned this thus far (I am in the digest mode, so maybe someone already did.) I remember reading in Shutterbug earlier this year that the Sigma 120-300mm F/2.8 is better optically than Sigma's own 300mm F/2.8 and cheaper too! While there might be other issue like focus speed, durability, etc ...., I believe that Sigma is now offering a 4 year USA warranty and that should cover any potential problems, except for the obvious user abuse, impact damage and so on. Anyway back to the article, I also remember reading that it's only slight less sharp than Canon's 300mm F/2.8.
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