When Porsche decided to do the Cayenne, naysayers said it would hurt the brand’s sports car image. Needless to say the Cayenne has been a huge success for the German automaker. Now Porsche is out once again playing with fire with the four-door Panamera which analysts say - you got it - will hurt the brand’s sports car image.Covers will be taken off of the Porsche Panamera early next year and it will arrive on the market in late 2009 in a segment that will soon see sedans from Aston Martin and Lamborghini.At launch, the rear-wheel-drive Panamera will come with...