Tricky question. Not that much.
Previous car was a bit of a stopgap for a year - an Audi A7 BiTdi - we should have just got a Tesla then. Audi was great when it was up to speed but with it being my first non-van/jeep diesel the noise on startup and at slow speeds just ground me down. Horrible. I even fitted a kufatec sound booster to help the BiTdi exhaust speaker (yes really) sing a bit louder. The 'positives missed' list is the sunroof, the dash controls and the slightly solider construction. Handled well too, if a bit detached. Other than that, nothing at all.
Previous previous car was a CLS55. Now that I miss a lot. The noise, the looks, the noise, the colour scheme, the noise, the feeling of pressing the pedal connected to 475bhp of thumping supercharged V8 powering a pair of tyres - brilliant. Fuel costs, fragility, age - not so positive.
Model S is slightly (only slightly) poorer build than the Audi and probably on a par or better built than the old Merc - give the MS a sunroof (I couldn't pass up the non-s/r car I got) and some heater knobs and it'd win hands down - as a barge it's capabilities more than make up for a lack of soul.