Always an interesting discussion point and much more useful than "270 is the best" sort of threads.
On your list I've had the Z5 and VX5 . . . . Both sold off, wouldn't bother with a Z5 again, to "delicate", might entertain a VX5 again.
I do have an Optika6 3-18 and really like it, but it's not on a "high country" rifle, I'd prefer something lighter.
For your purpose you only need a 1" tube, that helps a lot with weight and will easily dial to sane hunting distances including 600M (if you must, why people bother is beyond me).
And 1" tubes with the best contemporary glass are just not on the radar of most manufacturers, fashion has not served us well.
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