I will say that my X5 wasn't garaged for significant portions of its existence. The clear coat has failed, hence the repaint of the hood and the roof, where it looked the worst.
Regarding seats, the pic below is of 5s0NG's driver side seat temporarily swapped into my X5 to test that the functions would work. The taller backrest on the 2006 comfort seat clearly shows when compared to the OE 2002 passenger comfort seat. The headrest too is of a different design. Its mechanically adjustable, while my OE seats didn't have that function.