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Eric,
There is a not a lot of difference at the blue/green part of the spectrum (maybe 10% better) but the gap increases to 100% improvement in the red part of the spectrum. H-Alpha sensitivity is improved more than 4x.
Many astronomical objects emit light across a wide range of wavelengths (including stars) so close to 50% overall improvement is about the right order. Keep in mind some objects (like reflection nebula and some comets) don't see any real benefit.
Interestingly if you don't replace the filter the Infrared sensitivity is far better (1 or 2 orders of magnitude) and even the blue and green pixels are sensitivity to it. Its normal to use an astronomical IR/UV block filter to replace the standard filter to prevent IR from effecting the colour balance.
Terry
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