Greetings- so in reading up on the new HD designation - for the Crossfire line, what it means is that they have formulated a new lens coating (think FMC), which is supposed to be a bit better, so they now use that on all surfaces, and gave it the marketing tag "HD". Crossfire HDs are terrific bins, I'm writing a review on my new 12x50s right now.
I found a few more distinctions between the Crossfire HD line and the Diamondback HD line:
(1) D-Backs use dielectric coatings on their prisms, Crossfires do not;
(2) D-Backs have slight ribbing on the sides of the binocular for grip, Crossfires are smooth;