I looked at the 120-300 recently but decided it was just too big and bulky for what you get. The IQ was good, but not up to the standard of the primes I normally use. I have owned a 100-300 f4 which was very good and worked nicely with a 1.4x tc, but I chopped it in against a 100-400 IS... the Canon was sharper wide open and gave richer colours. If you want the length then the Canon is the better option, if you need speed then Sigmas have the edge.
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