Sophie Menter was a renowned pupil of Liszt, and her etudes reflect the high-velocity pianism of the late 19th century. The work explores the fluidity and technical requirements of playing rapid thirds.
At Henle 8 this is concert repertoire: professional-level technique is the entry ticket. The main demands: fast passage work that stays light and even at tempo; fine finger independence within the hand; and precise articulation — the difference between crisp and blurred is the piece.
Beyond that, expect continuous sixteenth-note figuration that must ripple, not chatter.
Focus on keeping a relaxed wrist to maintain evenness during the rapid scale passages in sixths.
Comparable difficulty and character — good candidates for what to learn next.
A level or two down with the same spirit — ideal if this piece is still out of reach.
Where this piece's skills lead: slightly harder works making similar technical demands.
Etude in Sixths (Op.8) is rated Henle level 8 of 9 — concert repertoire, roughly diploma level. In the RCM system it corresponds to about level 9.
You should be comfortable at Henle level 8 — meaning you can already play level 7–8 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 Etude in Sixths (Op.8) lasts about 3 minutes.
Etude in Sixths (Op.8) 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 Italian Concerto in F major by Johann Sebastian Bach, Waltz in A-flat major by Frédéric Chopin, Bamboula by Louis Moreau Gottschalk — see the full similar-pieces list on this page.