Thank you very much! For OTA download, those are the same file sizes I get on my Paperwhite 3 so it doesn't seem as if the Oasis 2 is getting higher quality versions.
Question, how did you check the resolution for the azw6 and kfx files? For Naruto, is the resolution still 1250x1920? I wonder if the retina iPads get higher resolution versions. Thanks for the Naruto ASIN. I was originally trying to look for free manga but a search for "free manga" wasn't giving me any hits. Meanwhile, searching for "FCBD" (Free Comic Book Day) gave a ton.
Also, what version of K4PC are you running? Just updated K4PC to 1.17 and it only downloads azw3, no azw6. It does seem as if the file sizes on the product details page are based on the total download size for Kindle for PC (and I guess Mac, as well).
Again, a BIG, BIG