I hope to see K Juju soon, but otherwise I don't think I'm a reliable source of reference for you.
I saw K Jessie a long time ago, and I rated her looks 7.5/10, with the comment that her face looked rather "long". I recently saw K Bella, and I put her down as 9.5/10. I find her beautiful but natural-looking. If she had cosmetic surgery on her face, then it looks minimal. I've had a few other K girls at Ginza but they're gone now.