Okay. here we go.
This was the test: very simple.
Lenses: I got the chance to test a pre-series sample of a 70-200 2.8 IS L provided by Canon Bangkok for comparison with my own 70-200 2.8 IS L.
Testing conditions: The test was done during a G&N session of my Thai friend Somchai Thothong, a local famous photographer shooting for the local issue of Playboy. We worked very hard. 4 hours non stop. Astonishing girls, and very professional. A lot of fun, as well.
Results: Of course, I cannot post the images here in this forum. I will be considering the G&N forum for that. But I think images of the lens right after the session are demonstrative enough:
its a matter of fact that the L holds the distance much better.
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you pros: no doubt you want the L
you newbies, amateurs and dummies: why not considering the L
(you deserve it)