It's not hard to detect the outstanding body-line. It's attractive, but it is beautifull?
In every case, Seven seems to be in the show to bring some sexuall attraction in.

But I dont have to use words. Her body speaks for itself.

Kes is smaller than Seven. But she does really not look twiggy. Her breasts does not get the resistant-futile support like Seven owns.
Oh, did i said breasts? Tst tst tst, such words. "Voyager" is a SF-show, I think...? Made you own decision!

Did you have already recognized the face?
Seven of Nine does not have giant boobs, "only" XXL-sized breasts. Why was Jery L. Ryan hired? What do you think?
The very close clothes supports some features of her. How important are this, er, features for the SF-series "Voyager"?

Hm, Kes seems also like to wear it tight. But, her body is smaller and her (ahem) apples (g), do the same. But, who cares? Can beauty be compared with cm or inch?!

Kes' sweet smile scores!

Seven's face shows some interessting borg-implants. But without this, Seven looks not like an alien.
She got a strange hair-style.

I think you can agree with me: Seven is not ugly.

Kes' ears are not human, as you can see. This is the only alien-feature.

Now compare the noses. Made your own decision, again.

"Technically", Seven must be a real beauty. Look at the big eyes, the sexy lips. But that's all.

Kes is cute. But that is not all. You see, she is beautifull in the "traditional" way, too.