Porsche and Aston Martin are simultaneously launching big risk forrays into the hyper performance sedan market. Both cars represent attempts to bring sports car heritage, performance and design language to four doors, but only one succeeds. For your review, the Astan Martin Rapide vs the Porsche Panamera. I wouldn't be surprised if the Porsche was a technically superior car, but as Clarckson says, you just wouldn't.
Aston: Hot - Porsche: Not
Or, if you're really in the market. Try these examples of how to make a limo sexy
Maserati, the established player: Or if they make it, the insane Lambo Estoque. I'll have that one please: