I had an X6 for several years and rode and drove my friend's X5 often. If you think there is a big difference between two 5,000lb trucks that are the same height and width I would say it is more of a placebo effect. Blind folded I would be hard pressed to tell a difference.
2015 435i Convertible
M Sport, M Performance Power Kit
2016 Lexus CT200H
2016 Lexus NX200t