In the executive, flagship sedan segment there are a handful of players delivering the utmost combination of performance and luxury. The BMW 7 Series is one of the best sellers and for the 2016 model year, the brand’s stately 4-door enters its 6th generation; its first redesign since 2009. These types of cars often pioneer new technologies and this 7 Series doesn’t disappoint. Highlights include the extensive use of carbon-fiber-reinforced …