The Rachmaninoff prelude just has overlapping chords, nothing too unusual, and I third the notion of it being a great piece.
Don't you just love how people compare impossibilties to Rachmaninoff and Liszt?
Overlaping chords arent hard... a bit of pratise, and its done

According the musicologists, Lizt and Rachmaninoff were the greatest pianist of all time. As you know, they've composed their musics, according to their piano skills, which is almost impossible to reach. Liszt's Music requires a great technique to play his music. Rachmaninoff's Music requires a huge hand, and also a lot of technique (even if his musics are easier)...
Thats why we, musicians, compare impossible musics to rachmaninoff and Lizst: because their music is also almost impossible to play too.
To be honest, I've never played a piece from Liszt (dahans is gonna hate me for saying this =P), so I can't tell.
You're not the only one...
I never played Lizst, Mozart, Prokofiev, John Field, and almost Chopin in my life...
But Im starting to play Hungarian Rhapsody and Transcendental étude "Les Harmonies du Soleil" (Lizst), Concerto No. 27 in Bb major (Mozart) and Nocturne No.4 in F-Major (Chopin)...... Ill not be killed by dahans today! muahahah xD