I would guess that if people (whether birders, hunters, etc) just happened to try current S/Z/L bins side by side without previous exposure to marketing or having salesmen gush about the superiority of flat-field etc, many would leave with a Leica, very happy with its beautiful view, straightforward ergonomics, and build quality, not quite having figured out how the others seemed fussy in comparison and not caring.
I don't know about this myself. I think just as many, if not more, in those same circumstances, would choose a SF or NL (as Suffolk naturalist did just recently) for their wider field of view; some might also prefer the SF or NL handling, and/or might perceive the Z/S image to be "all sharp".
I think Leica's status in the camera world helps them just as much as Swaro/Zeiss marketing. There is probably also a difference between those who purchase binoculars for "the view" and those who use binoculars to search for things.