Merc began production of the full-size S-Class sedan in the early ‘70s, following the official adoption of the “S-Class” nomenclature. Previously dubbed the “Sonderklasse,” or “special class,” this ultra-sleek opulence machine is currently at the halfway-point of its sixth generation. Framed as Mercedes’ flagship four-door and boasting the best that Merc can muster when it comes to style and equipment, a pair of high-horsepower variants from AMG occupies the top of the S-Class pyramid, including the S 63 and even-faster S 65. Both iterations just got a mid-cycle update at the 2017 Shanghai Auto Show, with the S 63 gaining a raft of changes affecting everything from the engine, to the transmission, to the AWD, to the styling. By comparison, the S 65 is less new, but still hugely impressive. The party piece is under the hood, where the previous model’s turbo 6.0-liter V-12 engine remains intact, complemented by updates to the S 65’s exterior styling and kit. Meanwhile, the rest of the spec sheet goes unchanged, including the seven-speed automatic transmission, Magic Body Control Suspension, track-oriented AMG options, and tech-heavy safety features.