This fall’s introduction of the 2014 Cadillac CTS marks the third generation of the rear-drive sedan that shifted the division’s competitive focus from traditional brands like Lincoln to European luxury makes such as Mercedes-Benz and BMW. The original CTS did that with edgy styling dubbed Art & Science that blended Cadillac-specific cues like stacked headlamps and vertical tail lamps with aggressive character lines inspired by the stealth fighter. It was a polarizing approach to design, but the gamble pai…