I have to comment on this one!
"Luxury car quality" often means absolutely nothing, in terms of actual quality!
OK - interior may be nice, wood, leather, an engine smooth as silk etc...
But when it comes down to actual QUALITY, MB, BMW or Lexus can be beaten by other brands.
My father has a -91 SAAB 900i -16 with over 250 000 km on the clock (80 000 when he bought it).
This car still has original shocks, coils, steering rack, water pump, clutch, gear box, cat, ALL FRONT END PARTS, alternator, fan motor, heater core, headlight reflectors etc, etc...
I do all service on his car, and it has been super reliable - many old cars are.
Radiator, exhaust system (once), one head gasket and a battery, have been replaced beside normal brake and service parts.
Interior looks VERY good, seats are firm, cloth and belts are just great.
Engine uses no oil between changes (every 15000 km or so.)
Volvo 900/700 are no worse in these aspects.
I have been working at a Mercedes Benz dealer, and especially the new MBs are really disappointing...
just my 0,02 euro...
/Alexander