Have both.
Knight Ultralight Feels like a much higher quality gun. But it’s not twice as good, for being more than twice the price than the Optima. Breech plug is much harder to remove than CVA (you need to pull out a very small spring plunger while rotating the breech unloading rod/tool. The Knight is extremely watertight, using number 11 caps. Cleaning one vs the other is difficult in different ways. Once you’ve fully disassembled the Knight, it cleans easily. The CVA breech comes out easy, but getting the firing pin and trigger assembly clean is, at least for me, sluice it out, spray out moisture with compressed air, spray some lube in, and hope no rust develops.
Both are equally accurate for me with iron sights; never scoped either.
That’s been my experience.
To sum up: Knight Ultralight is much nicer, but CVA Optima is more than good enough, and a much better value.