Yesterday I had the opportunity to test Leica Ultravid 8x42 HD, Zeiss 8x42 and 7x42 FL. I compared them my Leica Ultravid 8x42.
CA is the same in Leica Ultravid that Ultravid HD. View with them is exactly the same. And Iīm able to detect very good CA in binoculars. But view in Leica Ultravid hasnīt changed.
Zeiss FL has much less CA that Leica, but nevertheless, 8x42 and 10x42 arenīt as good as Leica. I saw with them a worse image than Leica Ultravid.
But then I tried Zeiss 7x42 FL. I was very pleasantly surprised. It has a very low CA and hasnīt other great optics defects or aberrations as remarkable as 8x42 and 10x42 FL.
In my opinion, the best 42 mm binocular is Zeiss 7x42 FL, followed by Leica Ultravid.
Zeiss 7x42 FL is like Leica Ultravid, but it has much less CA which gives it an higher contrast.
I havenīt compared to Nikon SE nor Kowa Genesis XD. But I have tested Swarovski EL 8.5x42, 10x42, and Nikon HG 8x42.