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Controversial opinion generator
I compared the Vortex Diamondback (pre-HD version) 10x42, to a Leupold Yosemite 10x30 (the Luepold Yosemite are the same as the Kowa YF). The Diamondback won hands down, as it should, being a more expensive binocular. However, my review may not be that applicable to you, seeing as I compared previous generations of the binoculars in different sizes.Has anyone had the chance to test and compare any of the models?
From the binoculars on your list, I would take the Diamondback over any of the others. Better yet, buy a good used binocular.