Not sure it looks good when dirty, or...???
http://www.autogespot.com/bmw-m5-f10-1/2013/04/24
(And after having been in Monaco this past weekend and seen a crowd of vehicles in a "frozen" black colour, including a M5, Smart cars, delivery vans, plumber vans, scooters etc. the matte black kind of has lost it's appeal... Or maybe it's just me suffering from a overdose of matte things?)