Some of the Meopta scopes retain full clarity at Max power, my Optika6 3-18x50 is superior in this respect to a Delta Titanium 4-20×50, Sightron S111 and a Leupold VX5 3-15 I used to have. A Swaro 3-18 also got sold on from here cause it was a poor performer at higher magnification, and while I've never owned a Nightforce I've peered through enough of them to be pretty sure they mostly share the same issue - it's very common a probably to do as much with the final set-up and testing of the individual scope as much as glass quality.
Eyebox "design" is a different thing again but you can usually beat it by developing a consistent rifle mounting habit, and that has the dual benefit of considerably improving your shooting!
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