DxOmark weird results. Pentax K-5 beats the Sony A55 (and the Canon 5DmarkII)

So now I am really to start to be worried about their DxOmark results. They just published the Pentax K-5 sensor test and the K-5 easily beats the [shoplink 3617]Sony A55[/shoplink]. What’s so crazy about that? The K-5 and the A55 do feature the same Sony 16 megapixel sensor! How the hell did they manage it to have a 1,6 stop advantage over the A55? And is it possible that a full-frame camera like the Canon EOS 5D Mark II isn’t better than the K-5?

I understand that the imaging processor are different but I don’t know if that alone can explain the huge gap!