Interesting exercise… I did the same with a few “comparables” of my story, and got interesting results. (Do check amazon first, though; sometimes you can get all that info in the “stats” section of the book).
The reading ease (grade level) stats are always fascinating to me. My comps ranged from about 3rd grade to 11th. Books heavy on dialogue tend to have lower grade levels. I personally aim for about 6-8 grade.
Almost 1/3 passive sentences? Man, that would’ve put me to sleep! So far, I have ONE passive sentence in 150,000 words. I’m pretty darn proud of that accomplishment….
What is the book, pray tell? And what was so special about the story? Genre? Some genres have you flipping pages faster than others…. Peace, Linda