Having looked at the price list (not easy getting one BTW), Maserati is very stingy on standard spec with things like xenons, paddles, electric seats, metallic and any wheels over 18" cost options - the 20" wheels here are a ridiculous £2k extra cost. There are also a lot of linked options which just irritate.
I would have a petrol model but the diesel here seems more refined than an early QP I drove and is fast enough for a daily driver. There are still some annoying little traits like snatchy brakes, transmission tunnel intrusions, inability to stay in 7th or 8th gear in manual mode (my LandRover does this so please sort it out Maserati as it's great for the motorway), shallow boot entry and rear foot space which is compromised on B pillar to front of rear seat base on getting in/out but the latter two points are linked to the fastback styling.
Even the 'what is the selector doing?' gearknob is not as bad as earlier versions.
The contentious issue is suspension. This car is on the standard set up and it is ok, flat enough in corners and riding no worse than most modern Audis'. I suspect that the sports suspension option would be pointless and drewf has reported on this. Personally I would pay up for skyhook (standard on the QP) as the Ghibli S I drove last year had it and I thought it was great.
PS Like all big, modern auto German stuff if you open your door whilst parking to say look at the location of a while line, it will put the car in Park. I know why they do it but don't like it.