I love the eye box on Z6 scopes. I looked at Z5 2.4-12x50 and did not like it. 3.5-18x44 should be even tighter. There is $500 difference between Z6 and Z6i models but plex reticle on Z6 is way thicker than Z5. Both are assembled in USA but not sure why reticle is so different.My 2 cents is to Save some cash and get the z5 3.5x18 bt plex. I have had both the z6 2.5 -15 and z5 3.5 -18 bt plex at the same time. Compared both extensively. I saw no difference in any lighting condition between the two and I have plenty of elevation for my dialing.
I had a straight mil and moa turrets on them dumped the factory turret.
Only plus for the z6 was the mil turret vs moa on z5.
The z5 was lighter and much cheaper so it stayed.
I am buying Z6 2.5-15x44 scope but confused whether I should get illuminated or non illuminated version for western big game hunting for bear, elk and antelope.