Swedish carmag, Teknikens Värld. Since its in swedish I will mention a few things from the article.
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- Awesome sound, just as good as previous RS6.

- You notice the car is high and heavy car but still easy to drive.

- The car understeer on the track but feels neutral.

- Quattro feels safe but take away the real fun.

- You can reev past the redline without the car interfere.

- 20" wheels are standard in Sweden.

- The extra option recaro seats are worth the money.

- Ceramic brakes and adaptive susepension cost extra.

- The interior is very nice, feels exclusive with carbon details.

- RS6 or M5? well, he didnt want to say becuase he said it comes down to personal taste but the RS6 is one brutal car.