I recently purchased the Zen-Ray 10x43 ED2 and took them over to Sportsmans warehouse for eval. This is what I noticed when I campared them to the Swaro, Vortex, Minox, & Pentax in the same 10x class.... Note: using resolution target in store at 33yds
1. Swaro- clearest and easiest to look through : wish I could afford them
2. Minox HG/Zen-Ray ED2 - both crisp & bright. Zen is soft near the edges, but a touch brighter.
3. Pentax ED/Viper Razors - Clear with just a touch less brightness. Razor has best Ergo of all tested. Pentax seem easier to look through to get full FOV.
Summary: 1. Swaro easily outclassed the others tested. I just can't figure out why they feel so natural to look through. The others are clear and bright but there is just something about Swaro's that feel as if you are not looking through bino's (don't know how to explain it?)
2. The remaining 4 were a near toss up as far as clearness... with small pro's/con's to each. Zen's are the brightest with weak edges. Razors have best ergo design/feel. Minox/Pentax are most natural to look through.
3. The Minox, Pentax, Vortex are in roughly the same price range $700-$800 with Zen-Ray ED2 @ $420-$500.
4. Bottom Line: Swaro were best optics tested and Zen-Ray are best value among others tested.
Note: these are my observations ONLY. I am not very experienced with glass as I have owned the same pair of Pentax 10x43 DCF WP for 7yrs and I actually think they still look pretty good.