U.S. shoppers can choose between a 429-hp turbo- and supercharged 3.0-liter inline-six in the S500 and a 496-hp twin-turbo V-8 in the S580. Both are equipped with 4Matic all-wheel drive. A 48-volt electric motor eliminates delivery delay of those abundant horses, contributing as much as 184 lb-ft of torque to the 516-lb-ft peak as well as 21 extra horsepower for short bursts. Let it rip and 60 mph comes up in 3.9 seconds, with the quarter-mile passing in 12.5 seconds at 114 mph.

Source: caranddriver.com