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Hi Doug,
I work with several other pro photographers at a studio in Brisbane. One lens we always recomend (and our studio has 3) is the 100mm macro. It really can't be beat. It easily performs at a "L" level but without the body quality (not an issue unless your a press photographer) or the price tag. We use this lens a lot for commercial advertising and product photography. Its one of the sharpest lenses canon makes, including L series.
I must say though that I have only used it for "land" use and have not tried it on the stars. But I would imagine it would perform well.
I could always do a quick test for you on the weekend..... (I don't have a GEM but could do some quick exposures)
Also I would 2nd Phils comment in saying that the 50mm 1.4 is not really worth the extra money for image quality alone. It is biult better and has a distance scale. I own the 1.8 and love it for its cheap/nasty feel but lovely images.
Hope this helps.
Dave.
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