I was responding to an earlier post that claimed a Porsche Cayman would leave the CTS-V coupe in the dust when it came to some curves. Do you see the Porsche Cayman or Boxster anywhere on that list?
Also I'll point out that the OP is desiring a CTS-V coupe, a car that to my knowledge has never been to Nurburgring. It has more power and likely a stiffer chassis and I'm guessing it could best the time of the four door back in '09, but it is only speculation.
Now let's talk value-
2015 Cadillac CTS-V Coupe $71,000
2015 Porsche Panamera Turbo $142,000
2015 Porsche Panamera Turbo S $180,000
2015 BMW M5 $94,000
Isn't it worth it to save a few bucks if you like the way the car looks and you're happy with the way it drives? Like I said, I can't talk the guy out of it. Take the $109,000 you saved by giving up that potential 7.32 seconds you might lose on the Nurburgring and buy another airplane.

You will have a car well beyond your capability, light up your life and not need a second mortgage.