My daily driver is a 2009 CTS-V. I honestly enjoy driving this car just as much as my 2009 Z06. While it isn't as fast as the Z, I consider it a better car. It does everything well, and can easily hurt some feelings on the highway.
As for "grandpa" status, I don't remember any Cadillacs that looked
grandpa like mine does. Lowered on D3 springs, and rolling on HRE 20" wheels.
SW, I'd run my little Caddy against your stroked M5
Tony