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Message: <blockquote data-quote="Malcolm Stewart" data-source="post: 1326207" data-attributes="member: 6851">I bought a somewhat battered, but optically sound, EF 300 f2.8 L in 2006 and already had some experience with it, and was able to try both the Sigma 300 f2.8 and the 120-300 whilst visiting Focus-on-Imaging in 2007.  My camera was a 30D, and both Sigma lenses were bench clamp mounted. (Not as firm as my Benbo tripod, in my opinion.)The immediate thing I noticed was a hesitation and "clunkiness" when focusing, and whilst I did get some sharp images, I was surprised at the low hit rate for static subjects which were well lit, with a shutter speed of around 1/125 and higher.  Perhaps the AF was out, I'm not sure.  I still have my EF 300 f2.8L and it just feels better - and delivers, although I'm now using it against more challenging targets, where my hit rate is lower.</blockquote>