User blog comment:HollowIchigo58/High School DxD Season 4 Announced/@comment-90.202.240.151-20161027033301/@comment-9595671-20161027081039

And don't forget Jeanne, we don't know how big she is in the chest area, so she might aid Yasaka and Rossweisse. Though then again... only the main females seem to have any info on their BHW sizes.

I mean some characters like Tsubaki, Grayfia and Serafall are definitely in the size range of Rias and Akeno, and then we have what's implied about Gabriel's which seem to imply hers are the biggest.

For a series based on fanservice, Ishibumi doesn't seem to like to tell us much about details like that which are ones the fans probably really want to know about.