I have had, at the same time, all 10x42/40, the FL and Habicht (actual iteration), and HT and Habicht. Now, I have the Habicht alone....
In another post you participate, I wrote that, comparing the two samples I had, like the FL instead the HT because the unacceptable the milky veiling glare of the HT. A pity because, in my opinion, the HT is superior in all other ways specially its great ergonomics, focusing wheel and diopter adjustment design.
I must say these Zeiss (to me the FL but perhaps the HT to others) and the Habicht are different instruments. I like both.
The difference in brightness or light transmission is not significant to even mention it.
The control of the CA was superb in both Zeiss and is almost as good in the Habicht.
The central "sharpness" are great in Zeiss and Habicht. In my samples, the FL, a superb one!!!, had an unmatched sharpness or resolution!!! In all the Habicht I have had, various ages, the central resolution was also great!!
Now, the Zeiss have noticeable better short distance focusing and eye releif (not an issue for me because I don´t use eyeglasses).
I miss that FL and, if I find a good deal occacion on one, I will buy it.
In 2019, when I bought this late Habicht in Europe, I did compare some top roof ones: Zeiss SF, Swarovski EL, Ultravid HD+ and the Noctivid, all 10x42. The Leicas, both the UVHD+ and Noctivid really impressed me! I had forgotten that superb "rich" Leica view!!!! Along with a top lightweight 8x20/25, one of the Leicas will be my next, and last binocular I will buy.
Thanks very much PHA, lots of food for thought there.
For your 8x25 can I recommend the Zeiss Victory Pocket as the best option optically - better than anything else I have looked through. Unbelievably sharp and with a surprisingly bright and wide FOV for a pocket binocular. Also the single hinge design is much easier to use in my experience.