We have already put its younger ATS-V sibling through our long-term test for two months and now it’s the turn of the M5-rivalling CTS-V to undergo similar scrutiny. And let’s kick this off with a whinge.

Call me old fashioned, but I’m a firm believer that Cadillac should stand for grand, super luxury saloons with imposing dimensions that waft about. The suspension should be made from marshmallows, while the steering should loosely interpret your inputs. That’s the Cadillac I know from my childhood and that’s what I still pine for from the brand. I really don’t care if it can lap the Nürburgring in 15 secs.

However, misty-eyed reminiscing aside; I have to concede that the new Cadillacs in general and the V Series in specific are top-notch cars. There is serious engineering that’s gone into these vehicles. The CTS-V, for example, makes 640 horsepower. Take that in for a minute. That’s more than what a Lamborghini Huracán makes, and this is a practical, comfortable family saloon! As a result the CTS-V will go to 100kph from standstill in 3.7 seconds and hit a top speed of 322kph.

That said, the stratospheric power isn’t actually a surprise, because underneath the sensible four-door body hide the mechanical innards of the bonkers 6.2-litre supercharged Corvette ZO6.

In theory this makes the CTS-V more than a match for the BMW M5 and the Mercedes-AMG E 63 S, especially considering the asking price of Dh325,000. This, whichever way you slice it, makes the CTS-V blinding value over its German counterparts that are priced around the half-a-mil mark.

But here’s the thing. We’ve had an M5 on our long-term fleet and group motoring editor Amit (who else?) graciously agreed to test it for three months. His conclusion was that the M5, costs as much as it does because it’s worth that much money. It’s a rabid performance car that can be used daily.

Let’s see if the new CTS-V can leave a similarly positive impression over the next few weeks.