I own both Pentax XW & Vixen LVW. Don't expect the same performance with the same brand through out the focal range though. The Pentax XW dominates the shorter focal length range 10mm and down, Vixen out performs Pentax in the 20mm F/L. For comfort, I love the Pentax- and though the Vixen LVW's are great, I way prefer the Pentax for the comfort, the adjustable eye cup, I find the contrast a bit better than the Vixen, and it is dew resistant. In dew, my Pentax has never let me down, where as all the other ep's have. Some people apparently find the adjustable eye cup annoying, but once you get used to it soon enough, it's not a problem at all.
If you can afford the Pentax XW in the 10mm go for it! It is a Rolls Royce Lens.
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