Hi Julian,
I know that lighting makes a huge difference in how a photograph comes out, but there seems to be quite a difference between the paint color of yours and Garry's cars. Are you sure it hasn't been repainted since new?
I'd love to see more photos of your car, both in the current lighting and in bright sunlight.
My understanding is that MB's recommended color combinations generally paired darker exteriors with light interiors, and vice-versa.