If properly driven, there is zero time penalty in a manual car under braking and corner entry.  With auto rev match, even an average driver suffers no time penalty...

PDK makes for its advantage on upshifts (and launching, which doesn't apply on a track)
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73 Carrera RS 2.7 Carbon Fiber replica (1,890 lbs), 06 EVO9 with track mods. Former: 16 Cayman GT4, 73 911S, Two 951S's, 996 C2, 993 C2, 98 Ferrari 550, 79 635CSi