I don't know whether that is good or bad but it seems significant

From The Greatest Books of All Time, As Voted by 125 Famous Authors by Maria Popova. The article is technically a book review of J. Peder Zane's The Top Ten. She explains the methodology:

The Top Ten: Writers Pick Their Favorite Books asks 125 of modernity’s greatest British and American writers — including Norman Mailer, Ann Patchett, Jonathan Franzen, Claire Messud, and Joyce Carol Oates — “to provide a list, ranked, in order, of what [they] consider the ten greatest works of fiction of all time– novels, story collections, plays, or poems.”

Of the 544 separate titles selected, each is assigned a reverse-order point value based on the number position at which it appears on any list — so, a book that tops a list at number one receives 10 points, and a book that graces the bottom, at number ten, receives 1 point.

While the results appear to be interesting in the context of the individual writers; what influenced them, what intrigued them, what I find fascinating are the results in aggregate across the 125 authors. In many respects, the list is a relatively uncontroversial selection.

TOP TEN WORKS OF THE 20TH CENTURY
1.Lolita by Vladimir Nabokov
2.The Great Gatsby by F. Scott Fitzgerald
3.In Search of Lost Time by Marcel Proust
4.Ulysses* by James Joyce
5.Dubliners* by James Joyce
6.One Hundred Years of Solitude by Gabriel Garcia Marquez
7.The Sound and the Fury by William Faulkner
8.To The Lighthouse by Virginia Woolf
9.The complete stories of Flannery O’Connor
10.Pale Fire by Vladimir Nabokov

TOP TEN WORKS OF THE 19th CENTURY
1.Anna Karenina* by Leo Tolstoy
2.Madame Bovary* by Gustave Flaubert
3.War and Peace by Leo Tolstoy
4.The Adventures of Huckleberry Finn by Mark Twain
5.The stories of Anton Chekhov
6.Middlemarch* by George Eliot
7.Moby-Dick by Herman Melville
8.Great Expectations* by Charles Dickens
9.Crime and Punishment by Fyodor Dostoevsky
10.Emma* by Jane Austen

TOP TEN AUTHORS BY NUMBER OF BOOKS SELECTED
1.William Shakespeare — 11
2.William Faulkner — 6
3.Henry James — 6
4.Jane Austen — 5
5.Charles Dickens — 5
6.Fyodor Dostoevsky — 5
7.Ernest Hemingway — 5
8.Franz Kafka — 5
9.(tie) James Joyce, Thomas Mann, Vladimir Nabokov, Mark Twain, Virginia Woolf — 4

TOP TEN AUTHORS BY POINTS EARNED
1.Leo Tolstoy — 327
2.William Shakespeare — 293
3.James Joyce — 194
4.Vladimir Nabokov — 190
5.Fyodor Dostoevsky — 177
6.William Faulkner — 173
7.Charles Dickens — 168
8.Anton Checkhov — 165
9.Gustave Flaubert — 163
10.Jane Austen — 161

On the other hand, I recently read a quiz, How Thick Is Your Bubble? by Charles Murray which seems to have a resonance with the lists above. Murray is concerned about the growing separation and isolation of some commercial/cognitive/political elite who live lives remote and separate from the 99%. These people living in self-constructed isolation aren't necessarily "The Rich", they are people that occupy the nexus of power, money, knowledge and communication.

The authors sampled for this list would presumably make the cut for this new isolated elite and their responses seem to support Murray's contention. Granted, the editor stacked the deck by limiting their responses to fiction (novels, plays, poems). Still, it is striking to me when you look at the different lists - Can you picture anyone outside of the elite actually reading or enjoying much of this? Twain and Dickens (happy birthday by the way) most likely. Faulkner, possibly. Maybe Hemingway but I seem to find fewer and fewer people that have actually read any of his books outside of school. I want to say Shakespeare but am pretty certain I am not justified in doing so.

Could you claim to be occupying and experiencing the same world as most other people if your favorite books are Lolita, In Search of Lost Time, Ulysses, Dubliners, or One Hundred Years of Solitude. That just doesn't feel credible. I don't know whether that is good or bad but it seems significant.