Mercedes-Benz and their in-house performance arm AMG make some pretty serious four-door sedans these days in form of the S63 and S65 AMG. But if you want the absolute ultimate in this class there is only one firm you can go to: Brabus.

What this Bottrop-based company does is take in a standard Mercedes S63 AMG – which is a great piece of kit with 585 horsepower and plenty of luxury – and put it on steroid. The end result is this, the Brabus 850 with power output of 850 horsepower and a ginormous 1,450 Nm of torque, and a super-deluxe interior that rivals the business-class cabin of an Emirates airliner.

All Brabus Mercedes S-Class, regardless of the engine, comes with an exclusive aero kit. The styling elements are fairly subtle, but they look very classy and have significant aerodynamic benefits. The main ingredients include a carbon fiber front spoiler with carbon intake surrounds, wing inserts, side skirts, boot lid spoiler, and a diffuser with integrated tailpipes.

Inside, Brabus Mercedes S-Class can be converted into a mobile office and a luxurious one at that. But even if you don’t need the full iBusiness treatment, the “normal” package includes opulent two-tone leather upholstery package that covers everything from the seats to the door panels, headliner and the dashboard, carbon fiber trim pieces, sport steering wheel, illuminated side sills, floor mats, folding tables, and headrest monitors.