Sorry if this has been brought up before, I am new here. But I was wondering if the quality of glass is the same across the viper line? The 6.5-20 is very tempting for $469 but I was concerned that the glass might be along the diamondback line.

Also Im also eyeballing the leupold mark 4 lr 4.5-14 but it's hard to see a difference for almost double the price without seeing them in person. Is the glass that much better? And would it be worth giving up the magnification? I'm going to be shooting at 1000-1250 yds (well hopefully...one day) but don't have the budget for a nightforce without waiting another year and rocking a cheapo for now.
Thanks ahead of time.