When you come to a complete stop you are transferring quite a bit of energy/weight to the front end especially in car that weighs over 2 tons. Without the sport package (I don't know if you have it or not) its going to dive a little. Furthermore, you can't compare a toyota that probably weighs 1500 lbs or a sports car to the x5.

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2006 BMW X5 4.8is Lemans Blue/Beige/Dark Maple
-Nav, Comfort Seats, Heated Steering Wheel,
Rear Airbags, AUX Input
2009 BMW M3 Space Grey/Black/Carbon
-all options