[bojan]

I totally agree that generally DSLR will be inferior sensitivity-wise - actually, ANY bayer filtered colour sensor will have 1/3 or less the sensitivity (electrons per photons) compared with mono sensor, if not worse.
The exceptions are Foveon sensors, but they are of completely different architecture.
That is why professionals use only mono CCD's, because it saves time.
When I said it is not fair, I just wanted to point out that we can not really compare apples and pears (somebody said that earlier) :-)
But if we do, then we have to take correction factors into account. After that we end up with the roughly same result: the point is, we have to allow the same number of photons to be collected, and then compare the output.

edit:
NB: DSLR's are not astro cameras.. they just produce acceptable results in astro field, so you (we) can have two bangs for the same money.