The Mercedes-Benz W221(Chasis code) was unveiled at the Frankfurt Motor Show in 2005 with sales starting in autumn of 2005 and export to other markets beginning in 2006. Ever since the car has been a symbol of luxury and is regarded to be the best luxury sedan. The main competitors to this model are the German rivals Audi A8 and BMW 7 Series.
The Audi A7 is a style-focused luxury sedan intended to compete with the Mercedes-Benz CLS-Class and the BMW 6 Series Gran Coupe. Based on the more conventionally-styled A6 sedan, this four-door coupe brings a new level of style to the segment and gives the pioneering CLS a run for its money.While its Mercedes and BMW counterparts bring a V8 to the fight, Audi instead is relying on a supercharged 3.0-liter V6, which it interestingly refers to as a 3.0T. This force-fed V6 is good for 310 horsepower, 325 lb-ft of torque and a zero-to-60 mph sprint of 5.4 seconds. Those who want the power of a V8 should check out the A7's performance-oriented S7 variant, however.