I can't speak to the Leupold, but I dont think it handles ballistics the way the newer Sigs and Leicas do. I guess it depends on what you want, if you simply want LOS range and angle modified, and plan to use a solver or whatever for ballistics, I am sure it will work quite nicely. Personally, I think Leica's R series RF's are some of the best. Leicas generally 'hit their numbers' under most conditions, not just under ideal ones, and their glass is fantastic, a benefit I think most people underestimate. At first and last light, it really matters, I have a competitor's lower end RF as well as a couple Leicas, and it makes a huge difference. In addition, the glass on Leica RF's is good enough that it serves really well as a 'first look' monocular. Often, I don't need to pull the binos out to tell if it was a deer or a 'bush buck'.
If you are looking for a ballistic solution, I lean towards those with weather stations as part of the package because it makes such a difference at distance. There are a lot of options and considerations at that level concerning the equipment and the workflow. I did a review on the Leica 2700 on a couple other forums, suffice it to say it ranges very well, glass is fantastic and it's internal ballistic solution is actually very good because unlike the previous B model RF's, you can input a custom curve (can't do that on the 2000 for example). Out until Coriolis and Aero jump start to matter, it's less than .1 MOA off of AB via Kestrel Elite, usually much less.
Sounds like Sig may not be your favorite, but in case you want to consider these, the 2400 ABS is high dollar, but full functioned, with full AB onboard. There are some issues to think about on that one concerning temp and maybe wind if you are shooting super long (all hand held RF's exhibit the temp issue to some degree afaik), but Sig has new options in the BDX line that can bypass those questions. Up to the 2200, you can run AB ultralite onboard, and it will function more or less like a Leica b model (temp instability is still there but does not matter at it's limited distance for ballistics which is 800 yards). The 2400 BDX ads the ability to synch with a Kestrel and run full weather data and AB from it, with the solution displayed in the RF. Only played with a pre pro of those, so not sure how it will actually work in the wild, but it's a great workflow if it works as it should. By moving temp and wind to the kestrel, those questions/issues are resolved.
HTH, let me know if I can help out.
