DaveChapin:

 

Turbo:  
  520 hp @ 6,000 - 6,500 rpm
  0-60: 3.0 sec (w/ Sport Chrono)
 
Turbo S: 
  560 hp @ 6,500 - 6,750 rpm
  0-60: 2.9 sec 
 
With overboost torque, 0-60 is pretty much the same. And we see the S's 560hp is only hit in a rpm range above the Turbo's 6,500 limit.  Thus I expect the power curve on the S to pretty much overlay the Turbo.  And if the extra 40 horses do not appear across the rpm spectrum, I for one would see much less reason to spring for the S.
 

Although maybe not a huge performance advantage, having a car that pulls hard to redline (rather than running out of breath a little) is much more entertaining and makes acceleration in the next gear after an upshift much sharper, since one usually shifts at a higher rpm.


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73 Carrera RS 2.7 Carbon Fiber replica (1,890 lbs), 06 EVO9 with track mods. Former: 73 911S, Two 951S's, 996 C2, 993 C2, 98 Ferrari 550