2015 Kia K900 is a muscular four-door stuffed with leather, wood trim, and electronic amusements all as standard. The base engine is a 311-hp V-6, while a 420-hp V-8 is optional. The steering is numb and the suspension is soft. Kia wants buyers to think the K900 is a value compared with its more-expensive competitors, but we’d rather spend less for a car that is more about driving than gadgets.