You might also want to get that wineglass squeaky clean, I find that somewhat detracting.
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Just an addition:
My EF300mm f/4L (NON-IS) + EF 1.4X II is sharper than my 100-400 f/5.6L
But that's the very old EF300mm f/4L NON-IS which is out of the equation...
Who knows if they're even going to make a filter for the 6D though because they haven't produced one for any bodies other than 7D and 5D2.
I believe the author was a little naive in thinking that the lens would not have to be stopped down for astronomical purposes. Stars are the ultimate challenge for any lens. In fact, every lens has to be stopped down between 1 and 2 stops to get good stars in the corners. As a result, the 200mm f/2.0 still has a speed advantage after stopping down, and the four inches of light gathering ability is nice too.
Oh and what's the story with your equatorial mount? Did you make that yourself?
Go to the Indian Pass Peninsula!