Sensor wise, it's 1/1.7'', smaller than the 1/1.63'' one in the LX5. Guess that's part of their effort of pushing the aperture to f/1.4.
Size wise, see pictures. The game has definitely changed.
Well at least one thing is for sure: comes next year there will be many happy D-LUX 6 owners boasting Leica's impressive ability of making a Vario-Summilux.