I've seen 3; two in dealers, and 1 on the road. The other two were Alpina blue, while the one I saw on the streets was black. They all looked menacing. I could actually tell it was an Alpina from the distance because the front chin spoiler on the b7 makes it look like a person that's gonna eat you (the headlights look like mad eyes).
Past: '08 E92 335i|JB|wheels|"eater of HPFPs"
Present:'15 Mustang GT|401A|PP|Recaros|6MT
Sig pic unrelated. I like to go sideways and stuff.