Well, for one, it's 416 HP, and no XF-R has been officially released to the public in any way. And, if you want to just speculate, then speculation says the V8 won't be new, but a modified version of the current supercharged 4.2L engine, probably just with a bigger supercharger.
Whoa, whoa, whoa. I know engineers who worked on both the CTS and STS-V interiors and each and every one say the CTS is better in all ways. The CTS interior is the benchmark of its class and the STS isn't even close. The CTS has a much better design and feel to all of it. Its intent from the get-go was to be the class leader, and it attained that; the STS's design was just to get the car by. You can tell that just by comparing the interior of the NA market STS to the Chinese market STS.
Oh, and here's your ADD (yes, Attention Deficit Disorder) kicking in. The RS6 having 580 HP and not being a benchmark car is the new issue? Um, just think about it, what's that saying about Audi and the technology of its engine? Obviously, even with 580 HP, it isn't that great a car to have every other car in its class compared to it. Pay attention.
Aaaand back to the regularly scheduled Cadillac vs. BMW debate. Of course Cadillac set out for BMW. They also set out for Mercedes, Audi, Infiniti, Acura, Lexus, and others. They didn't target just the M5. To say they're chasing BMW is wrong because obviously, even if they don't realize it, BMW is now behind the game when it comes to the CTS. You can't chase the people that are behind you in the race. Process of elimination tells you that, hey, they're chasing you!
The 5-Series and CTS are in the same class and are different makes. The G8 and CTS are in different classes and made by the same company. You're retarded. Pontiac is a performance brand, Cadillac isn't, though it does have its performance V-Series line of vehicles. Therefore, the G8 requires balls-to-the-walls engines whereas the CTS doesn't. Its two V6 engines are more than sufficient, and when they add the diesel and V-Series LSA engine, it'll be even better.
CTS and 5-Series vehicles are similar, basically because they're in the same class. What is the big difference you're speaking of? You kind of lost me; you didn't clarify anything at all. Oh, and the CTS has been called out as the class-leader in technology, too.
Oh, and Cadillac's not afraid of the higher-end luxury market. Just because they don't target it with the CTS doesn't mean anything. By the way, the 5-Series isn't the high-end of the luxury market.
Cadillac isn't a Tier 2 luxury brand. This is a pointless argument.
What this means to you: Even if you win in the Special Olympics, you're still retarded.