Hmmm, well I got to say the Skynyx is better. I have owned both and the differences I found remarkable. For a start the noise is so much greater in the DMK just in raw frames. Now this image is done with Mars. I would be interested to see what he gets on Jupiter. With a short time to take the frames I reckon the difference would be more remarkable. You can take frames for over 5 minutes with Mars.
The other difference is that you can use 12 bit on the Skynyx; its not available on the DMK.
I reckon the larger pixel size makes a large difference too. With a larger well depth the larger pixels can take in more information before they discharge than the smaller versions.
The DMK is good, but it is not the same as the Skynyx. More tests of differing planets would be needed to convince me otherwise.