The 2014 Infiniti Q50 is a luxury four-door sedan that replaces the G37 in the Infiniti lineup. A rival for cars like the BMW 3-Series, Cadillac ATS, Lexus IS, and Mercedes-Benz C-Class, the Q50 goes on sale in the summer of 2013. The Q50 is also the first brand-new vehicle to emerge under Infiniti's new naming strategy. For the 2014 model year...