Mercedes-Benz has this category locked up. The S-class has won here each of the past three years.
"This is one vehicle that really hit the mark," said J.D. Power's David Sargent.
The S-class offers a long list of optional features, including massaging seats in the front and back, infra-red night-vision cameras and cruise control that automatically maintains a following distance at any speed. Of course, there's also the car's refined and powerful performance.
NEXT: Mid-size Car: Volkswagen Passat