Had a go in the 750i tonight - he got it home today.
It's been a while since I drove a decently large engine and I had forgotten what it feels like. Not that I've ever driven anything larger than a 3.5 before. I've driven underpowered petrol engines for a couple of years now and do occasionally hanker after the lazy grunt of a turbo diseasal.
TD engines maybe do feel grunty after a normally aspirated petrol engine, but this thing kicks them all into touch. Forget waiting on the turbo waking up, this thing has grunt available from tickover.
Another thing, racing cars aside, why do we bother with manual transmissions ? Who cares what gear you're in just nail it and go :-)
Few pics here.