The Quattroporte was always a special Maserati model; in effect a sportscar dressed up as a big saloon where its rivals were big saloons dressed up as sportscars. The improved version of the current sixth-generation model - the car we look at here - is the best thing Maserati has yet brought us in the top luxury saloon segment, but it needs to be good to keep up with the competition. Outside, there's a mild facelift, while the interior looks smarter and more p to date.