I've had good luck with my PST Gen II 5x25x50, haven't looked thru the Optika 6, so can't compare. Even with my old eyes, I feel the glass is quite clear/sharp, out to 600 yds. Can't say about farther distances, but, I think it will do well. My tracking test, was pretty spot on, even tho I had to tweek my click value slightly for elevation on my ballistic app., but, my return to "0", was spot on. I've got over
2500 rnds. thru it at this point in time, and have had no issues with it. Just wish it was a bit shorter, it eats up a lot of rail. Mac