I set off in quest of "the one" 8x32/8x30 quite a while ago. I have owned and used the Victoryl FL, the UV+, the Nikon E2 and the Genesis, just to name a few that might be of interest here. In fact, I have owned two samples of the Genesis, one between 2015 and 2017 and the other one for one year before I sold them only recently. I sold both for the same reason: I was not happy with their off-axis sharpness. I found myself focusing much more to get a satisfactorily sharp image than with the other ones mentioned above. Having read Paul's post I wonder if I had two lemons. When I put the Genesis, the Nikon and the Leica on a tripod for comparison, I was horrified. The sweet spot of my sample of the Genesis was so small I couldn't believe it. Sharpness fell off almost instantly once I looked at things that were ever so slightly off-axis. (I didn't look at a testing chart or anything but at things more real-life like the top of fir trees. While Leica and Nikon rendered the whole tree top sharp, the Genesis was only sharp right in the middle of the image, everything around it was blurred.) Somewhat astonishingly, there was a gain in sharpness at about 40% off the centre, which decreased to towards the edges again. Sharpness at the edge was poor to say the least. Also, this blur couldn't be focused away. I didn't test the first sample I had like that but I sold them eventually because it was too hard for me to get things into focus. Another thing I noticed was that when viewing at close range of, say 15m, the distances between twigs from my perspective (depth) were much more difficult to estimate with the Kowa than with the 8x Leica. More surprisingly, this was also the case when I compared the Kowa to the 10x32 Ultravid that should be worse in that respect due to its stronger tele-compression. I really wanted to like the Kowa but I felt it is clearly outperformed by all of the above mentioned binoculars.
My 8x favourites are the UV+ and, second, the Nikon E2.