Sara is totally YMMV, if you really care about "body" you do have other better options. Like many said here Sara is famous for her head skill and the "do me" look. For spinner you already hit the jackpot with guoguo, if you like tall model style, Alice at AMS and Ollie at NYAW are both pretty good, with one slightly more curvy and the latter one offers amazing Greece trip and toy option. Bella is also wild and if you never tried her you ... simply.. should do it once.
Fiona is almost like a different categories, this review kinda picks it up, her body is very average in terms of length and all natural C rack, great attitude and decent face (to me, at least), but in every details she is just very fine. She smells nice, her skin is smooth, and the shape of her hands/feet/legs are all balanced perfect in some sense. You can literally say she is kind of a perfect average? I do give her a thumb up and recommend it.