Miki sounds like Yuka with a much stronger voice to me or even a little bit like Yuuka. She's really good though, like girls better watch out she's coming for your ace position good. She's actually not that high on my ranking though right now. She's too good right now She's a fantastic dancer, singer, is charismatic and can even speak English which keeps the foreign fans interested despite her lack of underdog appeal. And her personality just doesn't stick out as much but I'll give her time. We still haven't seen much.
I like Haruna2's voice. Obviously she has a small voice problem so she'll be in the back for a while, but I hope lessons and learning techniques will help.