My 100-300 f4 is wonderful and I wish I could find more occassions to use it. The 24-135mm f2.8-4 is too soft until about f4 so the extra weight and cost associated with the f2.8 bit is wasted but after f4 it is sharp, bright and produces decent images. It is second hand and needs a service though. I would certainly consider Sigma when looking to purchase another lens.


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However I would rather have the Sigma 120-300/2.8 than the Canon 100-400 L but can't think of another Sigma lens I would want over a similar lens from Canon.
