Her ass is underrated, she really doesn't have a bad one. Especially not by Jap standards.

And it's funny that we all drool over her tits, but she's not really all that big in canon. Not even after the timeskip, her tits become "big" but not "huge." Not really. At least not by modern anime standards.

Yoko's really a case of being a complete package design-wise, she has no real dominant feature she's just a 10/10 girl as a whole.