This piece exemplifies the Empfindsamer Stil (sensitive style) associated with C.P.E. Bach. It is marked by sudden rhythmic shifts and delicate, highly nuanced ornamentation.
Focus on crisp, detached articulation to reflect the stylistic demands of the late 18th century.
Comparable difficulty and character — good candidates for what to learn next.
Allegro is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 6.
You should be comfortable at Henle level 4 — meaning you can already play level 3–4 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 Allegro lasts about 3 minutes.
Allegro 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 Solfegetto in C minor, H 220 by Carl Philipp Emanuel Bach, Canzonetta con 6 Variazioni, H.275 by Carl Philipp Emanuel Bach, Allegretto con variazioni, H.65 by Carl Philipp Emanuel Bach — see the full similar-pieces list on this page.