I'm a Pentax boy, Personally I like the contrasty, cool, crisp views through my Pentax
XW's over the Nagler range, but it a personal choice. I think most people go for
Naglers like people buy Nike... it has a name. Pentax XW's are right up there and in
some cases/aspects out perform in my book. Although I will be going for a 20mm t5
shortly only because 20mm XW is in 1.25" format. I think you should try before you buy.

Either way, whatever you go for Naglers, Pentax XW's...etc...etc... premium ep's
are a good investment and something you can keep for a life time. The perfomance
on a whole is pretty much the same it's the characteristics of each that usually sets
them apart, what one lacks the other gains so to speak. The ultimate test will be for
you to try (before you buy) and see what appeals to you.

regards,CS