Based upon the E-Class sedan, the CLS four-door coupe's low roof, small windows, and reduced interior space compromise access, outward visibility and rear-seat head- and legroom. The 5.0-liter V8 offers smooth and abundant power, but the seven-speed automatic often hesitated before downshifts and wasn't always smooth in our tests. A 6.3-liter AMG version is available. The quick steering offers good feedback, and the handling is capable, if not really sporty. Ride quality is mostly steady, but some side-to-side motions are annoying. Noise levels are hushed. Fit and finish are excellent, but the controls are complicated.