Except that there's apparently a lot of bespoke engineering in the X that isn't in the S. And the X5 was built on the 7 chassis, at least initially. I don't thi

Except that there's apparently a lot of bespoke engineering in the X that isn't in the S. And the X5 was built on the 7 chassis, at least initially. I don't think it shares much with the 5.