I'm surprised you didn't say CTS-V.
I was just thinking Maser versus Porsche. But if I was going to drop big money on a no-compromises luxurious sport sedan...gosh, I don't know, there's so many great options. M5, CTS-V, Quatroporte, Panamera, the upcoming Rapide...I just don't know. Both the Porsche and the Caddy would be vying for top of the pack, though.
And the best seats ever are in the Lexus LS460L/600H. All of the perks of the Porsche's...but with a recliner and massage!!!
The LS back seat is an absolute-no-compromises luxury sedan. The Panamera is what the back seat of a luxurious
sport-sedan should be. I don't think one is better than the other, they're just really different in my mind.