Does anyone know anything about the Lumia 820 camera???

To me (so this could really be "me" only) the one reason to buy the Lumia 920 would be the camera. I actually prefer the Lumia 820 because of the shells, colors, size and price. Quite a few things. There would be many other differences to be debated: But for me the decision will be made on "How much better is the Lumia 920's camera, than the Lumia 820's?" So: Does anyone know anything more than the specs sheet and OIS that could help decide what the difference there is (like sample pictures, Details about the sensor, optics and dual Flash)?