The question is: Does it make sense when DxO gives total score of D800 higher than that of D4? Yes or No?
The D4 scores higher at ISO performance, has higher frame rate and pro like body/features; Sports, actions, etc
The D800 higher DR, resolution and color depth thanks to high efficient smallpixels (amaizing actually, but not surprissing if you think of pentax K5 or nikon d7000). Studio photography perfect camera
The 5D mkIII would have been a great camera , 3 years ago; Canon technology is starting to look ancient. Regarding sensors Fuji and Sony are well ahead
As DXOmark explains a score difference of 5 represents a 1/3 stop difference; so D800 has a full stop better performance than the 5D mkIII (which is a lot) and 1/3 stop over D4 (which is not big deal)
The difference is the same as D7000 vs 60D, one full stop
DXOmark results show sensor performance; and the results they have published reagrding ISO are the ones I anticipated when saw Dpreview ISo samples, less than 1/2 stop improvement over 5D mkII. These Dpreview smaples had lots and lots of Noise reduction on them, still many people was thinking that those were amaizing results (is people blind or what?)
What really suprises me is the low dinamic range performance of this new sensor, in my opoinion this puts canon to same. If this is best canon can do regarding sensor technology they should start thinking partership with sony, fuji or anyone fit for the job; they clearly are not.
If you do not need the new AF system or the weather sealing (always talking about photography, I do not know anything about video) I do not see any reason to update to this new camera over the 5D mkII
As a macro photographer I do not need those new features, I may get a second 5D mkII as back up if it goes down to 1000€ like last 5D classic units did
If it does not I will get a NEX 5-n or Nex-7 as second body, as I would like to have a high DR body and now NEX cameras can use EF lenses thanks to this new 400$ adapter (MP-E 65 included)