I agree that the composer he was closest to was Scriabin, he even married her daughter!
His other recordings are fantastic, too, always unique and with a striking tone. It's a shame his Rachmaninoff recordings (Well, all of them, really) are so rare.
He dedicated most of his time to Scriabin and Chopin. He was a true romantic. To be honest we should all thank both Vladamir's ( Horowitz & Sofronitsky) for playing Scriabin's works. Scriabin is not as popular as some for example...Chopin or Beethoven. He IS popular...but someone who is not as familiar as music would not be able to recognize Scriabin's music as they recognize Beethoven's 5th. Sorry English is not my first language... But we should thank them because if they did not play it...not so many other people would. It happens quite often that no one plays a certain piece until some famous pianist like for example Horowitz performs it.
Anyway back to Sofronitsky..,, Many people say that he had one of the greatest singing tones in the music of Chopin...One of his teachers, Aleksander Michalowski helped him obtain a singing tone in Chopin's works, being that he was described as a "having a profound influence upon the teaching of pianoforte technique, especially in relation to the works of Chopin"
But where did he get such a talent for performing Scriabin? I guess only nature can answer that. His Verse La Flamme is truly amazing!