If I see Brandon Sanderson's name on a book there's a 100% chance I'll read it at some point and bully my friends into reading it.
I don't read Non-Fiction very often.
I have read many encyclopedias though — usually regarding ancient mythology and history.
Difficult to say. If I had to answer I'd say The Emperor's Soul.
My favorite classical novel is without a doubt The Picture of Dorian Gray.