A few thoughts I think relevant here and elsewhere in the Bf. bins. section. Not personal. No offence meant. I try to leave out a. much a.p. the subliminal and the sublime except on how the former may be suspected.
• A lot of disagreement in Bf. on finer variations in optical quality between bins is due to differences in visual acuity among users. ("Normal" is 20/20, 15/20 is less sharp, 20/15 more sharp; very many people are at 20/15 or better.) A person at 15/20 may well see as equal the optical quality of two bins which a person at 20/20 will see as different; so with 20/20 and 20/15.
My own v. a. is 20/15 as I reckon (*pl. see note). I can quite easily see that an "alpha" is better than a certain "non-a." which several or many people aver in Bf. and elsewhere is equal to alpha; so can a friend who, too, I reckon is at 20/15 if not better. (*Note: from the chart at the opticians. But the lady there was finicky about confirming this to me, prob. due to legal certification issues not relevant to me.)
A person at lesser acuity not aware of that may suspect humbug in those who claim to see a differrence.
What is said in the next two points is about opt. quality, at present, and is what I have gathered from numerous posts in Bf. Pl. forgive any omission. Names are in alphab. order.
• At 8x42/43 these are at the highest level. Leica Ultravid HD, Nikon EDG, Swarovski SLC HD, Sw. SLC (replacing previous), Zeiss Victory FL, Z. V. HT (replacing previous). No others.
• At 8x32/33 these are at the highest level. Leica Ultravid HD, Nikon EDG, Swarovski Swarovision, Zeiss Victory FL *and three more*, Kowa Genesis, Meopta /Euro HD, Zeiss Conquest HD.
A person who has used one of those three may mistakenly generalise that aplha quality is found in yet other bins much below alpha level in price.
So there. Non-Porsche people should be aware that *some* who drive these have a genuine appreciation of real quality/ies in the make or model, and the latter that *many* who resent them don't do so from envy.