TTAC reviews the 2011 Panamera and writes:
In sharp contrast, the Panamera sits like a sports car and drives like a sports car, albeit a very large one. The V6, though it posts respectable test track times and is far from the embarrassment it could have been, comes up a little short in visceral thrills, at least in its initial iteration. The specs for both the V6 and V8 suggest plenty of headroom for easy upgrades, but higher-winding, more powerful engines are only future possibilities. Though Porsche charges $12,690 for its additional pair of pistons, the V8-powered Panamera S is currently the way to go. Perhaps if someone else had combined sports car dynamics and an adult-friendly back seat in the same car, Porsche would not have had to. Until someone else does, there is no substitute.
Looks aside (It’s no secret that the Panamera isn’t easy on the eyes,) this car is a monster. If you’re considering a V6 Panamera, then the Panamera is not for you. Buy something else. Save yourself tens of thousands of dollars. If you’re going to buy this car, pony up for one of the V8’s. There’s really no other choice here.