A sophisticated example of CPE Bach's transition from Baroque to Classical keyboard writing. It utilizes characteristic rhythmic dotted figures and refined melodic ornamentation typical of the Empfindsamkeit style.
Mastering the specific rhythmic realization of the ornaments within the Polonaise pulse is essential.
Comparable difficulty and character — good candidates for what to learn next.
Alla polacca in D major, H.217 is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 6.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 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 Alla polacca in D major, H.217 lasts about 4 minutes.
Alla polacca in D major, H.217 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 12 Variations auf die Folie d'Espagne, Wq.118/9 (H.263) by Carl Philipp Emanuel Bach, 12 Variations auf die Folie d'Espagne by Carl Philipp Emanuel Bach, Solfegetto in C minor, H 220 by Carl Philipp Emanuel Bach — see the full similar-pieces list on this page.