Well, there you have it then...D800 is better than D4. Nikon should remove D4 from the market since it clearly sucks and DxOMark proves it.
The D4 has 3 specific and significant advantages for pros with specific needs, such as sports and news:
Very high fps
Fantastic build quality and sealing.
For them, these are critical factors.
Since it is not possible to build a 36MP camera with high ISO and high fps (yet), they have to make a choice and do without the high MP.
For most other photographers, these three issues are less significant and not worth extra dollars.
One day in the fairly near future it will be possible to have your cake and eat it - 36MP, 10 fps and 50K ISO. It's just a matter of time.
The exact same arguments apply of course to comparisons between 1Dx and 5DMkIII.