[Katsunami]

Here's my comparison using this book on the Kindle Paperwhite. In this order:

1 and 2: Set to use the book's built in font (Publisher Font).
3 and 4: Set to my normal reading settings (Font size 4, DejaVu Serif Fat)
5 and 6: Set Font Size to 3, to try and match font size of pics 1 and 2.

Comparisons:

1-2: 29 lines x 52 characters, total 1508, Publisher Font
3-4: 28 lines x 48 characters, total 1344, DejaVu Fat size 4
5-6: 31 lines x 52 characters, total 1612, DejaVu Fat size 3