I reply to your question about 1,000+ yds it is difficult to say. I tried both but you do need to find a suitable reflective target. They are both comparable and at that range unless you are superman there are far more varriables to think about than the distance.
When I had them I RF a magpie on a lawn at 457 yds and they both gave the same reading. The Zeiss is a one press operation with a nice round red target ring. THe Leica is a dual press with a small thick box.
The best set up would be the Zeiss rangefinding laser set up in the Leica's.
Zeiss allows you to switch from yards to metres where as the Leica is fixed.
The balistic computer on the Zeiss is really a gimmic, it would be much better if you had the facility to programme in your rifles balistic data into the bins, then you would have a truely exceptional piece of kit.
Optics are comparable and depends on your eyes.
The Leica's controls are silky smooth but whilst the optics are excellent the laser function needs to be updated.
I use a Leica microscope on a daily basis and although optics are good they are light years behind in ergonomics cf Olympus and Nikon. Its one of their major failings, they always lag the market. Pity Olympus dont make scopes and bins.
I intend to write a full review but time is at aprimium at present. More than happy to provide more info if need be.
D