When I drove the Toyota equivalent to the GX 460 the handling was so bad that I thought that one or more of the tyres were partially flat. I even stopped to have a look at them and then checked the pressure at the next service station. But everything was okay.

And my point of comparison is a E53 diesel with non-sport suspension, 17-inch wheels and all-terrain tyres, so it's hardy at the pointy end of X5 handling spectrum. (Just more practical as a good percentage of my driving is on rough, unsealed roads, farm tracks etc.