Last year I decided the difference was so minimal that I was planning on selling the Ultravid, seeing little benefit to keeping it.…one would expect UV to be clearly superior to BA/BN, as some say it is, though seldom specifically how…brightness difference seems minimal…and the contrast a bit lighter (which I actually like), while otherwise the overall character is very similar. If you like one you'd like the other…
Then one day as I was looking at some cherry trees the difference gradually became apparent.
Like you, I found the brightness boost to be minimal, but detectable. Where the biggest difference lay was in the additional contrast and richer color saturation.
Oddly enough I too prefer lower contrast at times, but mostly in photography and the high contrast and color saturation are both big pluses for those who like those traits.
The legendary BN feels so perfectly designed for holding comfort and I’m keeping it, forever, but the equally excellent handling traits of the Ultravid, combined with its visual properties makes it an undeniably superior viewing tool for those of us it was designed for.