No body roll, or at least significantly less body roll than I see in my 996. I'm guessing your 2011 X5 (mine's an '07) doesn't have the Adaptive Drive/Active Steering/air suspension (most do not). Part of the three tons of my car is an incredibly complicated system of hydraulics, roll bars, and computers designed to keep the vehicle level at all times.

Here's a couple of videos showing the system in action. First video is a description of the system, and the second video shows a tech testing the system.