Yes, for performance only the 150mm F2 is the best. However there are a few outstanding ones as well.
The 50-200 SWD is the best allround Lens (and my fav - its most of the time part of my E3)
The 12-60 is the best Standard Zoom Lens of all available and together with the 50-200 its just the perfect walkabout kit.
The 35-100 F2, because its a superb lens and perfectly usable for Lifestyle, Fashion and Event Photography.
The 7-14 is still a unique lens, esp when you are looking for "Crop" System.
Timi
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iThink, therefore iMac