I picked up N. K. Jemisin's Inheritance Trilogy Omnibus yesterday (Nahadoth! New Novella!) and was struck by the size.
Here's the Inheritance Trilogy up next to a few other books on my shelves. The Dreamblood Saga & books 1 and 2 of the Imperial Radch Saga (Ancillary Sword and Justice), then The Name of the Wind and Mirror Empire on the right. Erikson's Malazan books (minus the last) tower over them in back, and up front is the Earthsea Trilogy.