An interesting comparative review.
It was good to see the three side by side, in a relatively real world situation. The model is going to be moving around after all, and maybe changing clothes, but her face, and more specifically her eyes didn't change. Taking pictures of a person rather than still objects or test charts gives more information on how they compare imho. There may have been slight changes of the lighting coverage, but like I said, it was a living moving subject rather than a test chart.
I would have expected the D700 and D3 to render images the same way, but that was not what had been observed.
And even though I have a D300S I wouldn't have expected it do come out so well. It would have been interesting to see the D3X in there too, but it would have give the test a different point for many readers.
Obviously this was comparing the cameras in a certain situation, and the different cameras may excel in different situations and subject matter. but they are all 12Mp sensors at heart, so I think the test is a valid one.
In certain situations the cameras can do a similar job, but then most people take images in a number of situations, and would buy the camera that best met their needs. Obviously budget comes into the equation as well for most people too.
But it was good to see how they compare.
The D300(S) is a professional spec camera, just with an APS-C sensor. Nikon themselves consider it to be a Pro camera as has been said. The 7D is Canon's Pro cropped sensor camera.