So most people think it's LotR.
There is a very big difference in the reading experience though. When using an e-reader, or a paperback, I mostly read on the couch. With the illustrated version of LotR (2005, Illustrated by Alan Lee) this is not possible; the book weighs 2.5kg. You can't hold that comfortably for any length of time. It has to be supported somehow.
I put that one on the kitchen table, and then support my head with one or both hands; I read that book the same way as if I was studying something. (Same goes for all of my other hardcovers; the ones I still have are all huge, except for the two smaller illustrated Sherlock Holmes ones.)
Therefore, I still wonder. I can imagine that if I swap the huge LotR hardcover for something like
this huge version of Sherlock Holmes, I would still be able to read without distraction.
Maybe I should try and put the KA1 onto a stand and read as if it's a 2.5kg hardcover. But still, it won't come close to be big enough.
edit: however, I can't go back to reading only paper books, because a few years ago, I gave them all away due to lack of space. I now only have the absolute favorites as hardcovers.
With regard to fonts: I've noticed I've been using fonts much larger than the ones in my LotR book. They're effectively 3-4x as large, even though it's not really necessary.