If a quick BMW sedan is what you're after, you don't need to spring for a new M5 when you have this as an option.
Ford has the Mustang, Porsche the 911, and BMW the M3 and M5. Sometimes, this results in other great offerings going ...
The current-gen BMW M5, also coined the G90/G99 ... If you're okay with buying used, and you also want a quick Bimmer sedan, the G30 M550i xDrive deserves your attention.