I did several searches on a very wide range of topics (business, chemistry, health, history, places an a person)and got:
Wikipedia position in Bing serps: 2,1,1,3,1,2,1(with huge logo),1
in Google serps: 1,1,1,2,1,2,1,1
I am counting the Google maps link on the serps, because people will percieve in as a search result.
So Bing ranks Wikipedia a little lower, and for encyclopaedia type searches the "reference" button can be very prominent (for others it gets lost in the long list of options). It is not quite as bad as I first thought, but still, I think bad news for reference type sites).
@tangor, I have stickied you actual searches (cannot post here because obviously)