i had my left rear quarter panel repaired and painted, can't tell it was repainted. I was happily surprised, i expected to be able to see it since i have the metallic gray. i would be more nervous about paint from a factory that you are hoping have not changed their paint in the slightest.
the question I would have is, What happens if you buy the factory painted bumper and it doesn't match. you will go through a lot more pain trying to get that replaced.
2009 750Li - Space Grau Metallic, Camera pkg, Conv pkg, Driver Asst pkg, Lux Seat pkg, Lux rear seat pkg, Prem sound pkg, Sport pkg, HUD, Massaging rear seats, Smartphone integration, Sat radio, MTEC H8 4750K Halo lights