I don't think it really matters that much because the people who buy these cars aren't caring much about a .4 or 1 second variance 0-60
I am sure they care about speed in the end.
It could be easy to say that BMW owners dont matter how they drive anymore since BMW's have not been sportiest cars for quite a while now... even that 740i, while much lighter, cant outhandle LS500. But I am sure it is not true.