I have an XW7 and Stratus 8 and comparing the views in each of them, the difference is fairly marginal, the XW by a couple of whiskers! The Stratus range have got a very good reputation for clarity etc. at around half the price of an XW. If you are on a bit of a budget, but can stretch to a couple of hundred, I would recommend the Stratus or Hyperion which are very similar.
As noted by others in the group, the XW14 does appear to have a bit of field curvature, and I can confirm this myself in mine. I don't have an equivalent Stratus though, so I can comment on how the equivalent compares. The XW14 is not as "good" as the 7 or 10 though.
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