Well I haven't driven it, but here's where I got the "coarse" concept from in the review:
"One efficiency measure that can be turned on or off in any mode is the auto start-stop, which turns the engine off whenever you come to a full stop. It is the most glaring flaw on this car. It is rather coarse and noticeable, the car shuddering every time the engine shuts down at a stoplight or in stop-and-go traffic. For a $70,000 car, as equipped, or even its $56,900 base price, or anything wearing this prestigious badge, this is disappointing for such an esteemed brand. The best way to put it is that I felt let down by a hero.
Beyond the lurching restarts, the engine demonstrates diesel-like refinement at low-revs; in other words, it quietly clatters, and the vibrations trickle through the steering wheel and seats — at one point I was wondering if this was just a massage option, but I checked the feature list, and it’s not."
All of the above is not in keeping with what I feel a $70k-plus premium luxury / sport sedan should be. Others, of course, may well take a different view.
Jaeger