I might appreciate the improvements but no one is able to tell me what they are exactly.
This is definitely one of those situations where you should try it side by side with the 5D II and see for yourself.
At least you have a list of actual features here.
Of course that's only if you want better autofocus, better noise control,
Exactly why I bought the 1DX.
My 5D Mark II body survived several dozen hikes, climbing two mountains, and three trips to South America. Also the 1DX has better build quality than any 5D camera.
faster frame rate , a wider ISO range,
Yep, that's why I bought the 1DX.
Where?
and more customization options,
Where?
a refined viewfinder experience,
How will this "refined" experience give me better photos?
Yes, a nice feature I got on the Mark IV.
m/fn button, much faster live view operation
Was it slowing you down?
and access to live view, arguably better overall ergonomics. Just to name a few.
It sounds like you were really struggling with the 5D Mark II interface.
I value all of those things, but I/we aren't you.
These are a list of small incremental improvements.
Using a camera can often bring up little surprises too, either good or bad, that you can't research before hand. It's just how the world spins.
So again, it's up to you Scott.
Yes, it was up to me. What did I do? I bought 1DX that I'm still using today and I
waited for the 5D Mark IV which had all these incremental features additionally ones that I found very useful that I use on every trip I take.