"Up front, the driving experience is unerringly pleasant. Aside from the silly transmission shifter cribbed from a Prius, every control is straightforward. The various modes are selected by a twist-and-push knob at the top-right of the instrument cowl, just like on the LC coupe. The electric power steering has just the right amount of assist, while the suspension is plush in every drive mode. There tends to be a lot of body motion, but all of it serves to quell any unpleasant sensations from the road. In part because active noise cancellation is standard, the cabin is as quiet as in any sedan outside of a Bentley or a Rolls-Royce.
Under hood is a new biturbocharged 3.5-liter V6 engine with 416 horsepower and 442 pound-feet of torque. That's plenty of punch, and there's no denying the LS 500 is a quick car with practically no turbo lag. But the effortlessness of the engine's power delivery -- that peak torque is available from 1,600 through 4,800 rpm -- precludes the car from ever feeling terrifically eager or frenetic. It's just a strong, smooth, predictable engine, all traits that serve a big luxury sedan well.
The engine is well matched to its attendant 10-speed automatic transmission, which deftly shifts with almost no noise or vibration. In busy traffic approaching the Golden Gate bridge, there are some occasional clunky downshifts, but as multispeed gearboxes go, this one's pretty faultless."
-- Jake Holmes, Motor1.com