Known as the 'Black Keys' étude, this piece is almost entirely played on the black keys of the piano. It is a brilliant display of digital dexterity and light, fluttering articulation.
Students must develop extreme lightness and evenness in the right-hand fingerwork to maintain the character of the piece.
Comparable difficulty and character — good candidates for what to learn next.
Étude in G-flat major, No. 5 is rated Henle level 7 of 9 — late advanced repertoire, roughly ABRSM grade 8 and above. In the RCM system it corresponds to about level 10.
You should be comfortable at Henle level 7 — meaning you can already play level 6–7 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of Étude in G-flat major, No. 5 lasts about 2 minutes.
Étude in G-flat major, No. 5 is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include Waltz in A-flat major by Frédéric Chopin, Fantaisie-Impromptu in C-sharp minor by Frédéric Chopin, Ballade No.3 by Frédéric Chopin — see the full similar-pieces list on this page.