I have 19" wheels on my 997--the rotors look small. I know the S brakes are more powerful, are the rotors bigger?

 

Brake disks on the 997 Carrera discs are identicle in size to the '04 996 Carrera.
Ft= 12.52dia, 1.10 thick
Rear=11.77dia, 0.94 thick

The 997S brakes are larger:
Ft= 12.99dia, 1.34 thick
Rear= 12.99 dia, 1.10 thick