550 and sq7 ... comparison isnt right. should be x5 or x6 compared to SQ7
Compare S6, S7 to 550.. anyway..
As you can see clearly from above video. What I mensioned. X drive does things to quick. But in real world, on real driving conditions x drive sucks... vs quattro.
Just putting to much power to wheels ending in loosing grip.
You need to drive car, x drive and quattro by yourself to see things and in snow.
Below are better comparison. Same type of cars