Hofmann's study is a tour-de-force of left-hand technique, requiring rapid arpeggiation and precise control over harmonic shifts. It showcases the brilliant, salon-virtuoso style of the early 20th century.
At Henle 8 this is concert repertoire: professional-level technique is the entry ticket. The main demands: a left hand with real melodic or rhythmic responsibility of its own; fast passage work that stays light and even at tempo; and sweeping arpeggio figures that must stay smooth across positions.
Beyond that, expect chord voicing — bringing out one note inside a handful of others.
Achieving evenness in the rapid arpeggio figures across the full span of the keyboard is the central technical requirement.
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 for the left Hand alone (Op.32) is rated Henle level 8 of 9 — concert repertoire, roughly diploma level.
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 for the left Hand alone (Op.32) lasts about 5 minutes.
Etude for the left Hand alone (Op.32) 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 Devil's Mill by Józef Hofmann, Hungarian Rhapsody No. 2 in C-sharp minor by Franz Liszt, Rhapsody in Blue (Solo Piano) by George Gershwin — see the full similar-pieces list on this page.