I don't understand why anyone would intentionally set out to use the Leicas over the Swarovskis; The Swarovskis were purpose-built to be used with a tripod and come with a post to attach their adapter to that works beautifully. The Leica has some after-thought cradle and strap setup that defies logic. Both are good glass but the Swaro is so much easier to set up and use.
I can't imagine how good the Zeiss 15x60s would be with that kind of technology stuffed into them!
Well.......last time I checked the Zeiss tripod adapter is very similar to the Leica one with the strap setup. What does that tell you?