...DXO scores seem to be on the money, not just with the D800, but with all the cameras I have personal experience.
The GH4 scores mimic what I expected form using it for a few weeks before the score popped up.
Are you suggesting that everyone's usage pattern mimics yours?
That's not what he's saying. He's simply saying that his usage of different cameras and the resulting IQ from images that they create corresponds to the relative performance of cameras as scored by DxO. His observation is interesting and should be testable regardless of usage pattern. For example, if you were to go out and
use Nikon's D800, would the difference in IQ between the 5D3 and D800 correspond to the difference as predicted by DxO or not? If it does then wouldn't that indicate that even if DxO's absolute numbers are wrong that the relative difference as suggested is correct?
Speaking as someone who shoots a significant proportion of my images above ISO 1600, with a fair number above ISO 6400, I can tell you that DxO's Scores absolutely do not mimic the cameras with which I have personal experience.
And why is your usage pattern any better than his to use as the basis of which ISO level is more important to build the basis of a score upon?
It's too bad that flickr doesn't have an easy way in which to build a cross site survey of what ISOs people use to take photos with to find out which is the most popular.