A buddy of mine bought a brand new Super Program right when they came out. His girlfriend who eventually became his wife worked at the airport and was able to give him special access. He was wanting to shoot some double exposure shots and told me that his camera couldn't do that so he borrowed my Contax 139. He was very happy shooting my Contax.
If you want to shoot double exposures this may be something you want to look into. I don't know if my buddy knew what he was talking about or not.