My question in the thread title is obviously not one of much interest to others here. But... I will close this out with my own observations, having purchased and used BOTH of the bins I asked about:
Leica UVHD+ 10x42 and Zeiss Victory SF 10x42.
I had become well-acquainted with the UVHD+ 10x42 and thus, quite enamored with them. I was so happy with them, that I truly did not expect to want to give them up for the pair of Victory SF 10x42s that were to arrive subsequently.
When the Victory SFs arrived, I wasn't all that excited with the large and long form factor. The smaller UVHD+ just felt better to me at first.
For the first few hours of comparing the two, back and forth, again and again and again, comparing them over and over and over... I was about resigned to return the Victory SFs and keep the UVHD+. I didn't see a clear superiority with the Zeiss - the image view between the two is quite close to me. I love the Leica razor sharpness, contrast, and color quality and the Zeiss was quite similar... didn't improve on that, in my view.
And, the Zeiss bins had a noticeable rough spot in the focus wheel when viewing at about 16' distance. One more reason to send the Zeiss back.
But, to be sure, I decided to give a few more days of careful use before deciding and requesting a return of one of the two pairs.
With additional use, that rough spot on the Zeiss focus wheel has just about fully worked its way smooth. And, I'm finding that I can achieve a much quicker "fine focus" adjustment with the Victory SF than I can with the UVHD+. The image with the Victory just pops into focus more easily and much quicker. I have to work the Leica focus wheel more, to get to that fine focus spot. Less tension in the Victory focus wheel, vs. the UVHD+ focus wheel, likely helps with that.
And, of course, the Zeiss weight balance toward the oculars makes them feel lighter than they are, even though they are longer than the Leicas. Pretty cool trick Zeiss did there!
I find little difference between the two in field of view, at my usual distances. And, I see little if any difference in brightness, color quality, and contrast between the two bins. Image sharpness is, as well, difficult to choose between the two. They are both quite impressive binoculars!
So... judging on what I see through the bins... they are quite on par with each other in field use - I would be quite happy with either one in this regard. The biggest difference for me is how readily I can bring the Zeiss to sharp focus vs. the Leicas. And, that's a noteworthy difference to me.
I don't wear glasses, except for reading, so suitability to glasses wearing is not a factor of concern to me.
I do like being able to wrap fingers around the barrels of the Zeiss. And the balance toward the ocular end of the bins is pretty cool.
But I love the feel of the Leicas - they just feel exceptionally solid and so very well-made - even more so than the Zeiss does. And the Leicas are more compact. They're better looking, to my taste, too!
So... bottom line... both are exceptionally pleasing in nearly all aspects. Both are easily "alpha" grade. Either is exceptionally nice to have and use.
The decision has come down to one significant factor: the speed and ease of achieving fine focus. And in this case, Zeiss wins.
Much to my surprise, I will be returning the Leica UVHD+ 10x42s - a pair of bins that I was sure I would not want to return. I does help my decision that I am KEEPING the Leica UVHD+ 7x42 and UVHD+ 8x32 bins.
In the case of deciding on 10x42s, it was well worth it to buy both of these, and compare closely for more than just a few quick hours of comparison.
Returning the Leicas will leave me with a wonderful set of optics that I am very blessed to have and use:
Zeiss Victory SF 10x42
Zeiss Victory SF 8x32
Leica UVHD+ 7x42
Leica UVHD+ 8x32
Swarovski CL Pocket 10x25
Swarovski CL Pocket 8x25
I really love each and every one of those bins. They each cover a special position of applicability. Including the Zeiss Conquest HD 10x42 and 8x32 that my wife has chosen for herself. She's not much of a binocular user, and much less picky about them than I am, and she's totally thrilled with the Conquest HD offerings, which I too have been thrilled with for many years until deciding to dip my toes into the alpha world.
It is a real joy to use any one of these bins. We are so fortunate to have them available to choose from.