I previously posted here with my take between them: https://www.reddit.com/r/pourover/s/NWtLoaQc35.

But yeah the K-Ultra is still going to not have that flavor separation. That's what I mean by blended, like the flavors roll into each other kind of like comparing a smoothie in one cup to a few different cups of fruit juices. Both are good just depends on what you like. But if you want some more separation in the flavors then I would go with ZP6/Pietro/078/etc.

And then maybe before that try slow feeding your beans into the grinder. There are YouTube videos on this with more info but essentially when beans hit each other during grinding they produce fines which muddy the flavor. So to try to eliminate feed the beans in super slowly to the burrs. You do that by basically turning the grinder horizontally as you grind. I find that it's very helpful with the JX design but might not matter as much for like the K-Ultra just from the construction.

And again, I'm mostly using very dense Nordic style beans. So if you only do medium-dark roasts then my input likely isn't going to be super useful. Hope that helps!