In my score, during the repetition of the opening theme, bar 5, the G flat major chord changes directly to an E flat minor chord, as is played in this performance.
However, the performances by Kissin and Horowitz goes from G flat major, Bflat 7th then to e flat minor. Is this an edited version, by Schubert himself or some publisher?
Personally I like the second version a lot more, but I'm not sure if it's "original".