...there's an NA engine for the A6? News to me.
The 2.0T has been progressively updated again and again since its introduction. It started off at 200hp and its now around 250hp in most applications I think, so surely there have been some hardware changes along the way.
And of course the ZF 8 speed is a biggie.
Any way you cut it the powertrain is much fresher than what Lexus is pushing in the GS350. Not to say that the Lexus powertrain is bad, because it isn't. But it's been the same for a long long time.