I see it also on my car,and it's 100 % oem paint from the factory(Silverstone II) and never repainted !
What i wanted to say is....different materials,bumper-frontspoiler is plastic,hood is aluminium;doors...metal.
So difference in surface..(.material) gifs a different shine in the color; the hood is aluminium and shine's most on every ///M3 !
And with any bright color....MW in your case it's even more visible !
Why i now this...my friend is the owner of a top paint shop !
But i see it in the pics of you...it's just to white...your oem paint is more grayer with more shine on it.
Conclusion...outside in the day light it is even worse, and they must do better !!!
But it will be not easy...even not in a very good paint shop