Ok. this could be a nice change, I love the Turbo in the 335i - very nice indeed, but at the same time, revving out an engine when driving an M10 - well that also is a great feeling.
Whatever happens, I will hope that fuel economy is less (although it's an ask getting better economy out of turbos) but then with the trick technology that's emerging...
As for MB & Porsche - sure they are up there with the HP...but they arent even half as good as X's handling and drive

. I drive my X on a road not an airport strip. Having said if the car is on par or even better, in performance, well then, that's a double win reason over the others too....
Thats why I enjoy the X - it's so true what they say - about the BMW X's handling as good as a car half its size.