If you are content with eye relief of your 22 Pan, you would probably be happy with the 20 Nagler which is apparently superior optically to the 22mm.
I have the 22 Nagler as I prefer the extra eye relief. I never really noticed the less than perfect edge until I recently looked at it with and without a paracorr - the paracorr cleans the edge up nicely. I've had no trouble with kidney bean but I always observe seated so my eye is always steady - might be a problem for observers who stand? The click stop adjustment has been stiffened on more recent eyepieces and I don't find that it slips too easily.
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