Bought an Autocar today because of an interesting article.
They had a test between the new facelifted 997, the R8 and the GT-R. The 997 actually finished last of the three! Apparently it's moved the 911 game along, but the others have moved the sports car game along even further.
For the record, the GT-R beat both of them

Quite a good test though, if you can find a copy have a read.
It still hasn't really changed my opinion though. I think I'd still go for the 911. Forgetting the GT-R for the moment as we have plenty of discussions already open on that, the 911 is still the purer design for me, and much as the R8 is technically the more impressive and isn't compromised by the location of it's engine, it's pretty impressive how much Porsche has developed a concept that's essentially fifty years old (and older, if you count the 356 and the Beetle from where the basic design originally came).
And the R8 will never be a legend in the same way as the 911 is. For Audi, it'll just be a disposable sports car that will get entirely replaced when they decide they can do better. The 911 is
THE Porsche and probably one of the most recognisable shapes on the road.