D5100 Sensor is a PROFESSIONAL camera ?

We now know that DxOmark TEST reputation got better and better appreciation from other photography websites, magazines and institutions. A lot of other websites are using DxOmark test results for reference. Often DxOmark test results are the same as Dpreview conclusions on some cameras, at least they are not contradictory.

Now looking at DxOmark test result on D5100.

Why D5100 Sensor is RATED the same as Professional Cameras.

Not talking about everything else, such as metal body, speed, AF, tracking, metering, AWB, etc. Mainly comparing the SENSOR capability to produce professional quality images.

The Overall Sensor Performance:
Nikon D5100 rated 80
Nikon D700 rated 80
Canon 5D MarkII rated 79

And finally comparing to the "intended to be same class" entry level and enthusiast,
the D5100 sensor is way above the other.

Nikon D5100 rated 80
Canon 600D rated 65
Canon 550D rated 66

Why D5100 SENSOR is rated the same as professional cameras?

What does it mean in real world?