I had the Kilo 2000 and was very.impressed with the speed, consistency and various reflective ranges that it was capable of. Bought a Bushnell 1 Mile Conx rangefinder for reasons of Bluetooth.compatibility with my Kestrel weather station/Applied Ballistics calculator. Big mistake. as the Bushnell "elite" offering was a huge step backwards in terms of capability. I've just purchased a SIG Kilo 2200MR to regain what I lost when I sold my Kilo 2000. It has a number of incremental improvements over the Kilo 2000 such that the 2200MR (Mil Reticle) can be considered an enhanced version of the 2000 rather than. a full-blown model change. An easier to read auto-adjust display, sharper aiming point and slightly (?) better range are apparently the key advantages of the MR.
I don't have any experience with Leica so can't help you with that comparison. Your best bet might be to try both side-by-each for yourself at your LGS or nearest Cabelas....
A final consideration ought to be value for your dollar. From everything I have researched and experienced first hand, it will be hard to beat the SIG in that department.