The idea that you are "faster" in a car because of PDK vs. manual does not compute for me.  Lap times are a matter of relativity.  Are you faster than your last lap.  If you have different equipment then you have a different car and of course different cars are faster than other cars.  Not like GT3 is the fastest car.  You can always by a faster car.  So those who argue that they should get the fastest version of a car, I would argue that you can always buy a faster car.  For me the argument is are you faster than your last lap given the equipment you chose to have.  Be that PDK or manual.  If you are a racer, than that is a different argument as you are in a specific class of car (but you still aren't in PDK - )