Clark brings up a good point,, weight.
I have & like NF scopes, but they add ~a pound of wasted weight.
Their eyepiece rotates on power changes, which mungs up flip-up cover operation/bolt turning.
Speaking of which, NF puts a bungee scope cover in the box(which is poor in every respect),
so people generally use Butler flip-ups. And, NF optics are pretty much the same as Leupold(medium quality). But they offer great reticles. That's their hook.
With a Mk4, you can use the superior Alumina flip-ups. These scope are equal in accuracy and optics to NF, but lighter, and the eypiece extends without turning(as it should). Nearly same price... Get a reticle or other changes through the custom shop...
The Mk4 wins -overall.
If Leupold would offer it with better glass(as an option), there would not be 'better' anywhere.