Henryk Obuchowicz's Ballade Op. 5 is an ambitious, virtuosic work indicative of the late Romantic grand style. It emphasizes keyboard breadth and significant dynamic range.
The technical demand of large, spanning chords requires secure hand positioning and careful release to avoid tension.
Comparable difficulty and character — good candidates for what to learn next.
Ballade (Op.5) is rated Henle level 6 of 9 — advanced repertoire, roughly ABRSM grades 7–8. In the RCM system it corresponds to about level 8.
You should be comfortable at Henle level 6 — meaning you can already play level 5–6 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 Ballade (Op.5) lasts about 5 minutes.
Ballade (Op.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 Variations sérieuses by Felix Mendelssohn, Ballade by César Franck, Ballade by Samuel Coleridge-Taylor — see the full similar-pieces list on this page.