This work by Karl Klindworth, a famous transcriber, reflects his deep technical knowledge of the keyboard. It is a showcase of late-Romantic pianism characterized by dramatic dynamic shifts.
At Henle 7 this is a late-advanced work — the technical demands are serious and sustained. The main demands: polyrhythms that have to lock together without sounding mechanical; sharp dynamic and character contrasts held together in one arc; and wide stretches that reward larger hands and clever redistribution.
Beyond that, expect big chords that need weight without harshness.
The main technical hurdle is the execution of large, arpeggiated chords and rhythmic control of the polonaise pulse.
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.
Concert-Polonaise 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 9.
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 Concert-Polonaise lasts about 4 minutes.
Concert-Polonaise 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 Rhapsody in Blue (Solo Piano) by George Gershwin, Concert Paraphrase of Rigoletto, by Verdi by Franz Liszt, Concert Paraphrase Rigoletto S434 by Franz Liszt — see the full similar-pieces list on this page.