« on: April 05, 2013, 08:38:02 AM »
While there are certainly some inconsistencies in the data from DxOMark (most of which I expect come down to copy variation among tested lenses), in general their results are accurately measured and reported.
For those who think this is some kind of about-face that contradicts their previous measurements, keep in mind that their Sensor Score (on which the D800 trounced the 5DIII) does not consider sharpness at all, whereas these recently posted results consider only sharpness.
The real about-face here is more likely to be from people who believe or disbelieve DxO on the grounds that they are biased toward Nikon sensor superiority.
I recall Roger Cicala's measurements finding that the Zeiss 100 MP performs better on the D800E than on the D800. I still can't find a logic explanation for a lens that's capable of outresolving a 36MP sensor to deliver better detail on a 22 MP sensor - which is also known to have a strongish AA filter.
It's simple. The D800 has a better sensor than the 5DIII. Canon, in aggregate and on average, has better lenses than Nikon (in terms of sharpness, at least). The resolution we care about is the system performance = sensor + lens. So, while the D800 has a better sensor than the 5DIII, once you slap a lens on both cameras and take pictures, the resolution differences are a wash (on average across a large set of lenses, obviously specific lenses will vary). I and others have made statements to that effect before, DxO is just quantifying those statements.
And DXO I suspect would not care about the opinion of Canon users, they simply test equipment and publish their findings.
DxO is not a public service or a no-profit. They are a company, and as such they have all the interest in publishing things that will increase their popularity among users of the market leader company.