No, it's not a direct rival to the M5 and RS6, but Mercedes is democratizing the fast wagon (sort of) bringing this E53 ...

It was the third model produced at BMW's then relatively new factory in Greer, South Carolina, following some early ...

Although the BMW 550e and AMG E53 Hybrid use similar PHEV powertrains, they have totally unique personalities. It's wild to think how advanced, capable and efficient both of these vehicles are.