I haven't read the comparison article yet so I don't know how badly the Pcar was spanked, but were these two cars off the rack?
Typically .... very typically, when a car is destined for testing/review by a consumer publication, the manufacturers tweak them to perform better than one would ordinarily find one in a showroom. How much they were equally tweaked and still remain within the spirit of a "fair" test is anybody's guess.
If C&D was comparing typical Pcars and Vettes and the latter won, that says more about the current state of Porsche cars than the superiority of the GM. To outweigh the competition reveals the fat around the waist in Porsche's philosophy about what constitutes a performance car. However, one cannot argue the fact that Porsche remains the most profitable car manufacturer. So they must be doing something right for the right people (with large checkbooks).
Sherwood Lee
http://members.rennlist.org/911pcars