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Hi Paul
I have had experience with the XF8.5mm and echoing Chris, it is a lovely lens at a great price. I ended up selling mine only because I managed to find a secondhand XW10mm and the 8.5mm wasn't being used. The XW10mm is a fabulous lens and works exceptionally well in my 200mm f6 dob and 100mm f13 refractor. The views are very sharp, contrasty and stars seem to sparkle.
Can't comment on others except for a Pentax 8-24 zoom which was also rather good.
Andrew
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