Lee, what body are you using the lens on?
I ask as, not so long ago I was checking the focus speed of the 135mm f/2 L lens (an absolute beauty)...tried on the 350d which it 'hunted' badly on....then fitted the same to the 30d to find it locked on it's target almost as quick as my eye could focus. weird, as I had assumed the focus sensor is pretty much the same in both bodies?
On the nikon side of things, I've found similar comparing the same lenses on a D80 vs a D200, the D200 being massively quicker focusing with the bright prime lenses.
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