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Having used both the Pentax XWs and T5 & 6 Naglers (side by side for 10/11mm, 13/14mm and 5mm) I can only agree with John's excellent post, particularly his comments on colour fidelity and sharpness.
I would add only one other factor: the Naglers are more forgiving with eye relief IMO. While the Naglers 'allow' up to about 15-20mm, the Pentax EPs positively require it. I found 'kidney-beaning' and blackout to be major issues with the XW, unless my eye was perfectly placed. This I found pretty uncomfortable and so settled on Naglers.
I can't however fault the actual view with the Pentax XW series - beautifully crisp across the field and very neutral colour.
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