Well, as the owner of a Pentax XW 10mm, and a variety of other top-end eyepieces, let me say the XWs are a superb eyepiece.
Massive eye lens, loads of eye relief, adjustable eye cup, very nice colour and contrast, crisp.
I could rave for ages. So I'm sure the 7mm is also a peach.
I've owned a couple of LVWs and they are also nice units. Not quite up to the XW, but not far behind.
Might also be worth looking at a Radian? Maybe.
But have a look through an XW and I'm sure you'll happily part with the $$$$. Bellisimo!!!!!!!