Porsche 997 Turbo MkII & 997 GT3 MkII vs RUF Rt 12S vs Konigsegg CCXR vs Gumpert Apollo vs Murcielago vs Aston-Martin V12 vs Wiesmann GT MF5 vs Cadillac CTSV vs MTM RS6 vs CarGraphic 997 Turbo GT RSC 3.6 vs TechArt GTstreet RS (Sport Auto mag., 10/2009, Deutsch)

Aston Martin, Cadillac, Cargraphic, Gumpert, Koenigsegg, Lamborghini, Porsche 997, Ruf, TechArt, Wiesmann
  992 

Porsche 997 Turbo Mk I vs Aston Martin Vanquish S vs Bugatti Veyron vs Corvette Z06 vs Dodge Viper vs Ferrari 599 vs Ford GT vs Lambo Murcielago vs Mercedes SLR (Auto Motor und Sport mag., Deutsch)

Aston Martin, Bugatti, Corvette, Dodge, Ferrari, Ford, Lamborghini, Mercedes, Porsche 997
  1075 

Porsche 997 GT2 vs Alfa Romeo 8C vs Aston Martin V8 Vantage vs Maserati GT S vs Lambo Gallardo LP560-4 vs Megane R26R

Alfa Romeo, Aston Martin, Lamborghini, Maserati, Porsche 997, Renault
  1224 

Porsche 997 Turbo S Mk II vs Aston Martin V12 Vantage vs Audi R8 5.2FSI vs Ferrari 458 vs Mercedes SLS AMG (Car & driver mag., 11/2010)

Aston Martin, AUDI, Ferrari, Mercedes, Porsche 997
  1358