I don't speak German, but did they gain a mere 8hp on the CTS-V over stock?
Mercedes-Benz X 3
A German car beat an American car in a German car magazine? I'm stunned.
This isn't a fair comparison anyway because the C63 AMG Wagon isn't available in the US. And even if it were, it would be more expensive than the Caddy. Import fees kill the Caddy's value in Germany. According to the article, the V Wagon is 82, 530 Euros, which is $109k in US moneys. A totally fully loaded V Wagon stickers for less than $75k stateside.
So in Germany? By the Benz. In the US? The Caddy, 10 times out of 10 because you have to compare it to the E63 for size and available, and THAT car is $115k when similarly featured.
Point taken on the car pricing. Wow.
However, the V is 2 inches wider, 2 inches taller and 6 inches longer than the C63, and as has been noted, weighs 400 pounds more. The V is roomier on the inside in all passenger dimensions that Edmunds lists. So it's not surprising in the least that the Merc won the performance test. It's smaller, lighter and nimbler.
It's like comparing an M3 to an M5 competitor. The right size comparison is to the E63 (which others have done), which is much closer in size to the V. But the E63 is wildly more expensive.
It's a real a real shame that the V doesn't have a 7 speed transmission. Highway mpg would be helped immensely with another gear.