That is a good question, I have owned both rods and without going into to too much technical detail I would have to say the MH80H is a more modern i.e. slightly faster action and lighter rod than the WV. The main difference i see is in the tip half of the MH80H rod which is lighter and allows you to cast better but it works poppers up to 170gm ok and larger stick baits well. The butt section of the blank is big and you can feel the power when you hook a decent fish. I think the WV80xh has a slightly more parabolic bend (for want of a better term). The WV for me is big and powerfull but tiring to cast all day, I beleive designed to hang onto big fish in big current without beating you up too much, where the MH is as strong, a bit more easy to use but probably a little less forgiving than the WV.
You can see the bend on the MH80H in the picture, unfortunately did not get the very tip in the shot though.