Stanchinsky is known for his unique, highly personal language that sits between Scriabin and traditional Russian romanticism. This canon is technically demanding due to its complex inner voicing and irregular, modern harmonic progressions.
Achieving the required rubato while maintaining strict control of the contrapuntal lines is the major hurdle.
Comparable difficulty and character — good candidates for what to learn next.
Canon is rated Henle level 6 of 9 — advanced repertoire, roughly ABRSM grades 7–8. In the RCM system it corresponds to about level 9.
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 Canon lasts about 3 minutes.
Canon 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 Canon in B minor by Aleksey Stanchinsky, Canon a 2 voix en augmentation by Aleksey Stanchinsky, Berceuse élégiaque, BV 252a by Ferruccio Busoni — see the full similar-pieces list on this page.