My GSF has torque vectoring differential like one from Porsche and I think this is best feature from my GSF. Both my wife and I like it which can let drivers make turns easier specially on mountain roads. I'm a little bit surprised how good it is. (In my past experiences many extra features didn't really help...)
G37S coupe has 4WAS which is similar to torque vectoring differential (similar results but totally different approach). Of course torque vectoring differential is more advanced and expensive but 4WAS also can provide similar feel without paying big money...
PS: 4WAS is not new and it was already installed in some cars 30 year ago...