How would the Leupold stack up against the Nightforce product?

The general consensus is that the NXS NF is going to out perform the Mark 4 in just about every category.
The only catagory I can think of that might be close is customer service, in which the 2 scopes are probably equal.

If you got the money, pony up and get the NXS.
Though, I would prefer the 3.5-15x50mm