Well according to this test, the CTS-V hit 150 mph in 22.3 seconds. So it is in the ball park of these cars. And this comparison also has the Jag XFR and E63 AMG and the CTS-V was faster than both in this test. But this was too early to throw in the F10 M5
http://media.caranddriver.com/files/...rain-chart.pdf