As noted above, all are great scopes. I compared all you mention, as well as Leica, when I made my purchase except for the Nikon. The Swarovski 65 mm HD ATS was the best to MY EYES and ended up being my choice. Also, their warranty reputation factored in.
I had both the Swarovski 65 mm HD and the Leica 62 mm APO at my house for about a week and compared them side by side in as many situations as possible. To MY EYES the Swaro was a step ahead. I then compared the Swaro and Zeiss, this time only at the store. The Zeiss was brighter, but the Swaro seemed to have a better image for MY EYES. I keep mentioning "MY EYES" simply because your experience my be different.
Swaro Pluses: Focus mechanism, zoom eye piece, armoring, overall image, and warranty.
Zeiss Pluses: Brightest image, good price.
Leica Pluses: Great price (Doug at Cameralandny), edge to edge clarity was the best.
Test them all out as much as you can in as many situations as possible.