You have to note that these lenses are primarily designed for terrestrial use. The bokeh at f/1.2 on the 50mm is amazing. I have taken some gorgeous portraits with it. I ended up selling it back to Leon, though.
You might want to try the 200mm f/2.8L II USM or the 135mm f/2L USM for astrophotography. Much, much better suited and once stopped down a stop, aberration free.
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