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Hi Bert,
What the MTF charts don't show you is that the 85 1.2 has better contrast and colour at the wide apertures. In fact the 85 1.8 doesn't really kick in contrast/colour wise until relative to the 1.2 unless stopped down a bit but the 1.2 has excellent colour and contrast right from wide open. The bokeh is also better on the 1.2 though thats irrelevant for astro of course but is important for weddings/fashion which is what I shoot. Typically you don't buy the 1.2 for any sharpness increase, but for other reasons.
cheers
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