https://www.caranddriver.com/reviews/comparison-test/a15111166/2014-audi-rs7-vs-2014-bmw-m6-gran-coupe-2014-mercedes-benz-cls63-amg-s-model-comparison-test/
https://www.autoevolution.com/news/cls-63-amg-s-model-vs-bmw-m6-gran-coupe-cp-vs-audi-rs7-vs-porsche-panamera-turbo-74613.html
this car also does 0-130 mph in 13.0 seconds
and its Sachsenring time is 1:39.08