Here are these not-quite-sedan four-door cars. Audi RS. BMW M. Mercedes-AMG. Porsche Turbo. Four of the most iconic German performance nameplates. Three of these are liftbacks, and the other one is a fastback. The least powerful of the bunch, yet also the most powerful, is the Panamera Turbo. However, we'll have to step up to a hybridized version for the full 680 horses.
Unfortunately for the Aston Martin Rapide, it chose not to compete. It has rear-wheel drive and a naturally-aspirated V12, and its underpinnings are traced back to the original Vanquish (now 19 years old), back when the fastest production car was still the McLaren F1.
The Tesla Model S now has its own competitors, including the Porsche Taycan.
A more extreme RS 7 is not out yet, but I will use a leftover from its previous generation; don't worry, it can still keep up. And we won't see a GT 73 for at least seven weeks, so the fastest version is currently the GT 63 S.