The scopes are different. You would need to consider a 6.5-20 in the Mark 4 to do more of an apples to apples comparison.
I have, like, and use both
The Huskemaw is more slim-line than the Mark 4 with its turret length and is shorter in length than the Leupy.
The Mark 4 has more internal adjustment horizontally than the Huskemaw. For hunting that is not important, but of the other styles of shooting, I wish the Huskemaw had more internal adj for wind.
I will be stretching out the Huskemaw beyond 1K with the 338AX in the future.
I have been shooting 4-shot groups at 100 yard so far that are average sub 1/2 MOA from a bi-pod with my center-grip XP-100 specialty pistol (hunting trigger weight). I have the scope moved back as far as possible which leaves the ocular or the back of the scope more unsupported than would typically be the case with a rifle set-up. The Huskemaw is tracking well and holding zero perfectly
I have shot out to 1800 yards before with a couple of Leupold's with satisfaction.
For field use, I think the Huskemaw has an advantage speed wise for playing with multiple steel targets, since you dial distance and the wind is right there on the turret too, compared to a Kenton on a Leupold.
I also like the Huskemaw better for the reticle design for quick wind doping.
When it comes down to it, get what you desire.
Choose the one that has the features you want and like.
You will find people that will say one brand is junk, and then you will find another group that goes the other way.
Of course, you will find another group that will say both are junk and you need to buy brand "X" (what ever "X" happens to be for them).
I haven't listed all the features of each optic, but some that stood out to me quickly.