I just built up a 2018 Mercedes E63S over here in the United States.
Pretty much fully loaded and total MSRP came out to be $135,605 USD. This sounds about right.
https://www.mbusa.com/mercedes/vehic...ab=tab-summary
I will expect to see the F90 M5 exceed $140,000 USD as fully loaded.
That's just a tough pill to swallow for a car that has the same engine as the F10 M5.