User blog comment:AcobraL/Thoughts on Planty's Chika comparison video/@comment-68.184.24.236-20140917102448/@comment-53539-20140917174718

Len is closer to Ann then most other Vocaloids, and maybe half close to Flower in certain ranges, but she is closer sounding to Iroha.

Basically, Vocaloids with similair tone and range sound close to the same.

At this stage, the majority of vocal ranges are covered for females anyway.