DP Review names Olympus OM-D Camera of the Year 2012, beating D800 and 5D Mark III. Having had one for about 6 months I have to agree - it's a breakthrough in offering very few compromises over the full size SLRs while being substantially smaller for travel. It has replaced my Canon 1D Mark IV and library of big L and white lenses, especially with the excellent Panasonic 12-35 and 35-100 f/2.8 lenses (28-70 and 70-200).
While I had hoped the Leica Monochrom would get top honors (it's the real breakthrough) that camera is not really the market for DP Review readers.
Best Camera of 2012: And the Winner is...: Digital Photography Review