I was told by a salesman that drove both that the X6M beats the X5M in handling..
However, having driven the X5M on a near 1000 mile journey on every type of turn you can think of and at high speeds, I'm not so sure.

But lets just say for a second that the X6M is a tad bit better in handling, I can promise you, the X5M's greatest limitation in handling is the skill of the driver, not the car itself.

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"When two people agree on everything, one of them is not necessary" - Arliss