I found the "Hidden menu" procedure to bring out the real time coolant temperature reading on the gauge cluster which is really cool and useful.

The temperature stays between 95C to 105C, at city driving speeds with AC on.

In comparison, my 2011 328i hardly reaches above 100C, almost rock steady at 99C.

Looks like all is well but should I be concerned about the coolant temperature being 3-4C higher on X5?