Yet they are, for the sensor response. As usual, a single number doesn't tell the whole story though. Lens characteristics, the use of (clean) filters, a properly dimensioned lens hood, they all matter for the DR end result of the whole system.
Veiling glare has the most effect on the shadow areas of an image. So its effect also depends on the image content. Raw conversion can also make a difference. What ultimately matters is if the sensor can offer low noise low exposure level detail. When it does, then postprocessing can attempt to retrieve it.
I always look at the graphs. At base ISO, DXOMark claim the D7000 has approximately 2.5 stops better DR than the Canon 50D. My shots of Jonathan's DR Test Chart confirm that this is the case, that is, a 50D shot at a 350th sec exposure shows about the same detail, and same degree of image degradation, as a D7000 shot at a 2000th sec exposure, at ISO 100.
So for me, there's no doubt that DXOMark's test results for the sensor are valid and accurate.
However, we usually need a lens to take a photograph. Now, it's clear that lens flare and veiling glare can impact on the DR of the processed image, and one tries one's best to reduce such effects. I always use a lens hood. I never have a fixed, protective UV filter on any of my lenses because of the risk of reflections between the filter and the front element of the lens, and I often use a book or a card, or just my hand to block any direct sunlight when shooting in the broad direction of the sun.
The question I'm asking is, after taking all precautions against veiling glare and the obvious examples of lens flare, and after choosing a subject with the sun or major light source behind the camera rather than in front of the camera, is DR still limited by lens flare, and if so, how does that affect the relative DR performance amongst camera sensors, as described by DXOMark?
For example, if the DR difference between the 50D and the D7000 sensors is 2.5EV at ISO 100, is that difference reduced in practice, even under ideal circumstances, to maybe 1EV or 1.5EV?