Medtner's etudes are masterworks of complex counterpoint and dense, shifting harmonies. This C minor piece exhibits his characteristic rhythmic ingenuity and brooding, Russian Romantic intensity.
At Henle 8 this is concert repertoire: professional-level technique is the entry ticket. The main demands: polyrhythms that have to lock together without sounding mechanical; big chords that need weight without harshness; and sharp dynamic and character contrasts held together in one arc.
Beyond that, expect chord voicing — bringing out one note inside a handful of others, and several simultaneous layers, each needing its own dynamic level.
The complex rhythmic layers require significant intellectual work to articulate independent melodic lines against the dense accompaniment.
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 C minor is rated Henle level 8 of 9 — concert repertoire, roughly diploma level. In the RCM system it corresponds to about level 10.
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 C minor lasts about 5 minutes.
Etude in C minor 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 2 Cadenzas to Beethoven's Piano Concerto No.4 by Nikolay Medtner, Ballade No.2 by Frédéric Chopin, Scherzo No. 2 in B-flat minor by Frédéric Chopin — see the full similar-pieces list on this page.