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The XF-12 does indeed exhibit more field curvature than the XF-8.5 but it is nowhere near as much as the XW-14 or the XW-20. The XF-8.5 is a gem and the XF-12 is also a very usable and pleasing EP in pretty much any scope (to my eyes). Cannot say the same for the XW-14 or XW-20. The two XFs are essentially the same eyepiece with a more powerful barlow group in the XF-8.5. In a long barlow (Orion ultrascopic) the XF-12 is flawless in any scope from f/4 up. I tend to use it barlowed on planets and it's just gorgeous.
The XF-12 is also ideal for deep sky observing in f/6 scopes (which for most people means 8" dobs).
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