Sony Optical Finder for 16mm


There's an article in this weeks AP comparing Sony NEX5 Lumix G2F and Samsung NX100 it does mention that there is a Optical viewfinder with a field of view compatible with the 16mm Sony pancake lens. doubt that is much help to you.
By the by The result of the tests of the three cameras was fairly equal with the NX100 84% the other two 83%