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Pro Tour teams like to plump for Lightweight discs - a disc that is not lenticular but conical (due to how it's made)- so presumably it is 'fast' because it's stiffness and really light weight trump its shape.
I wouldn't rely on a lot of ProTour teams or riders to have much science to back that choice. 90% of riders in a TT stage treat it as a semi-rest day anyway.
gbj_tester
Pro Tour teams like to plump for Lightweight discs - a disc that is not lenticular but conical (due to how it's made)- so presumably it is 'fast' because it's stiffness and really light weight trump its shape.
Lenticular is probably the best shape a disc could be if it were a separate body, but like @umop3pisdn says, if a frame shields the wheel well enough, it's shape matters less, and most modern frames shield them pretty well (if not as well as Cervelo).
The way it interacts with the frame is probably where the gains/losses are (and that's also why Zipp discs have [mostly] always been flat - see last paragraph:
http://www.zipp.com/technologies/aerodynamics/boundarylayer.php ).