Wonderbar:

All of this is hard to follow.  I like AMG products as well, but I prefer the Panamera to the E class AMG.  There will always be comparisons of cars within the same "class" (Corvette versus Porsche, etc.), so just pick what you like and go for it.

Also, I am not sure of this, but my guess is that, during testing and development, Porsche extensively compared the Panamera to the AMG products in its class, and would not have produced a car that was less than or even equal to those products. 

 That is what you would hope, but are you going to take it for granted? So far performance still needs to be proven. Also The Panamera is 15% more than equivalent Cayenne for no reason, and has a very controversial rear design, and four seats only for such a large/heavy car.

IMHO after 12 months sales are going to collapse, and resale value are going to be even worse than the Cayenne which is already worse than any other Porsche (my Cayenne TT was 73% loss after 5 years FYI).