If I was married to an oil sheiks daughter it could only be the Brabus variant:
https://www.brabus.com/en/supercars/...-gv12-900.html
There are only 10 limited edition v12's.
I test drove the G500 and it was über comfortable. Rides better than anything other 'G' series they make.
You're right though by the time you modify it or go top end you could get yourself something else that you don't need to touch out of the box.