We have an X5 and an F10. Weekends, we take the X5 esp with our kid in the back. If space is what your wife is after, than the X5 is the choice. Going back to your original comparison. The F10 is a much larger car than the E90. While the F10's back seat may suffer in space a bit despite being a larger car, the interior is much wider and less cramp. As someone mentioned, how you position the front seats make a difference. I would have to add although the multi-contour front seats are comfortable and nice, they do make the rear cabin feel cramp.
2013 BMW X5 35i
Alpine White | Cinnamon Brown | M Sport
2013 BMW 550i
Titanium Silver | Black | M Sport
Last edited by Decboy; 12-06-2012 at 11:32 PM.