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Hi Wayne,
There are numerous threads on DPreviews where high ISO comparison ad nauseum are done between D800 and 5D mark iii. The bottomline is RAW image high ISO performance is much the same between the 2. JPEGs though Canon has a stronger noise reduction system and seems cleaner although the D800 does very well too. It depends on the poster but it is often mentioned the greater resolution also makes the noise finer and easier to remove and the extra dynamic range means the noise is more separate from the main image so easier to remove. Also you can downsample the D800 image to 5D sizes and that also cleans it up.
Bottom line is both cameras have superb high ISO performance but the 5D mark iii probably the edge on jpeg low light. 5D mark ii and 5D mark iii are not too different in RAW high ISO as Phil predicted but in jpeg and video it is.
So with that in mind both should perform well in astro images.
D4 and 1DX would be ahead again. I saw a fantastic video showing off D4 low light images and it was truly impressive. Sharp clean images that look almost like daylight in almost darkness.
Greg.
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