I believe the GT-R must be costing Nissan much much more than they charge for it. It is halo model and a big loss leader which is cross subsidized in the overall costing/pricing structure of this big manufacturer . The reason they do it is very obvious and very valid if you ask me. So a Porsche can never be perceived to be as good as a GT-R because price will always be involved in the comparison. Even if the FL Turbo is slightly better than the Nissan, people will say that this is how it should be given the price differential, so no big achievement.