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If you over-sample quite a bit a DSLR can perform virtually to the same level as a mono CCD. The reason for the loss of sharpness is due to the bayer matrix. A 12mp DSLR has 3mp of red, 3mp of blue and 6mp of green. This does not just limit overall transition but also resolution. All of this you are probably quite aware of.
If you under-sample using a OSC on a short focal length scope you don't get the same resolution as it is lost in "missing pixels"... so to speak. If you over sample you have several RGGB "pixels" covering each star.
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