HONG KONG (June 26) - Essence, Etherea, Emerg-E: three outstanding concept cars that over the past four years have helped define the seductive and individual appeal of INFINITI, the luxury performance brand. And all cars without which the latest INFINITI, the all-new mid-size Q50 premium sedan, could not exist. From its dynamic headlight shape to its crescent-cut C-pillar and purposeful sporting stance, the INFINITI Q50 embodies many of the most acclaimed design cues from its concept-car forebears in a spacious four-door body.