Bruce,
I am commending Caddy's achievements. To break the 8 minute barrier regardless of who is driving is incredible, but until SportAuto do their test we can only assume that it will be quicker than an M5, M6 or M3.
The other thing which is unknown is what the ride quality is like, making a car handle isn't the difficult part, making it handle and ride great is a different matter, few get it right, Mercedes, BMW and Audi to name a few. If this car gets test by SA, beats any of these BMWs and proves to ride as well as them then we can say for certain that Cadillac have produced a truly amazing machine.
P.S.
Keep the lip firmly in place on those worms old mate, things at the moment are peachy and we want it to stay that way.