The Mercedes-Benz claims to the first vehicle in the world to have no light bulbs — all illumination is LED. Benz also has a rear seat belt with an airbag function, spreading the load of crash forces on the passenger’s rib cage. The most torque of any Audi is generated by the 4.2-litre twin-turbo diesel V8 — 850Nm. This enables a 4.7-second sprint to 100km/h yet a claimed thirst of 7.4L/100km. Massaging front seats (with a handful of different modes) are standard fare on the A8. The Lexus LS600h is the only V8 petrol-electric hybrid, and the brand’s only all-wheel drive sedan.