Outside of the EL, I think the UHD 12x50 is the best 12x50 available. I have tried most of the top 12x50's and the UHD is my favorite. The UVHD 12x50 is nice, but the UHD has sharper edges and the AK prism makes it really bright. You're correct about the Papilio being sharp. It is the best value binocular you can buy at $100. The new Pentax ED 7x32 is the same way. It is tack sharp to the edge and has no CA that I can see. It is one of the best bargains I have seen at $329.00. I wrote a review on it over in the Pentax forum.I got a chance to compare the UHD and Viper in 12x50 yesterday and was thoroughly impressed with both.
Having not really cared for the EL, these are now in the running for whether to go Vortex or Ultravid now.
One thing that really startled me with the UHD was how they could focus so sharply, almost into the Papilio-zone. I was actually able to read the small print on the boxes directly in front of me behind the counter, and the extra length and weight over the Vipers made them very steady, much like the Ultravid.
I haven’t like any of the Diamondback series, but the Vipers and UHD are top notch binoculars absolutely for sure!
Binoculars rankings - 12x50 - AllBinos.com
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Pentax AD 7x32 ED
I wanted to try the Pentax 7x32 ED because I think their Papilio is a great binocular for $100, so I ordered one from Amazon.com and got it a few days ago, so I have had time to field test it. It is an impressive binocular at the $300 price point. The FOV is 7.8 degrees, so it is right up there...

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