My Choice: 
Reason: The design is everything I would want in a large vehicle. The design is sophisticated and unique. The technology is very useful and ground breaking. Also the engine is simply more then enough, but it keeps you happy.
Runner up: Jaguar XJ elegant styling and keeps to it's true form with old style luxury in the interior.
Reason for not picking other models: The Bentley is beautiful, but the design is not as detailed as I would like it. Lexus is a good design, but not as involved. BMW is very fun to drive, but ready for style to be updated. Audi has one of the best interiors out there, but the design is simple and to the point.