@adi that's funny, Vonnegut's style is not beautiful imo but also not bad. His sentences are short and rhythmic in a way that evokes a particular way of talking, he's one of those authors whom you feel has a strong presence, in the sense like you feel you can hear him speak.
Also I forgot to mention Invisible Cities along with In Search of Lost Time as a recent book that may end up a GOAT after time has put it into perspective for me. And if we can add poetry then Elizabeth Bishop also deserves a place in my list.
Ps @Frown, awesome that you mention Virginia Woolf, I didn't know you liked her that much