According to the brochure, exterior trim - high-gloss shadowline is standard on M Sport models. But I really can't see it. My understanding is that it refers to the window frame. The window frames on my zed are just matt black plastic, not gloss at all.
That's what I think. The A pillars on all E89 (standard and M Sport) have high gloss finish. I thought the whole window frame had too on M Sport and is.