One of the most recognizable piano works in the repertoire, this prelude is defined by its heavy, bell-like opening chords. It features an agitated middle section that requires significant technical power and emotional projection.
The main challenge is balancing the weight of the massive opening chords with the fleet-fingered demands of the middle 'agitato' section.
Comparable difficulty and character — good candidates for what to learn next.
Prelude in C-sharp minor, No. 2 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 10.
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 Prelude in C-sharp minor, No. 2 lasts about 5 minutes.
Prelude in C-sharp minor, No. 2 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 Prelude in G minor, No. 5 by Sergei Rachmaninoff, Canon by Sergei Rachmaninoff, Variations on a Theme of Corelli by Sergei Rachmaninoff — see the full similar-pieces list on this page.