I've had:
70-200/2.8L IS
70-200/4L IS
70-200/4L Non-IS.
Of these, the 70-200 F/4L IS is the sharpest, and fastest to focus..
the 2.8IS was just behind, and the 4L non-IS was just behind that...
Personally, If I was to be buying one now, I'd look at the F/4 IS or the F/2.8 IS... and If I had to chose one of these, the F/4 IS is cheaper, lighter, and sharper... Its a no-brainer!
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