The great Spanish woman pianist Alicia de Larrocha (HERE on YouTube) has small hands. Well, small compared to Rachmaninoff I guess. She comfortably spans an octave, but it looks like a ninth might be a tough stretch for her. And yet she plays Rachmaninoff in her repertoire! Yes, yes, I know that there are ways of ‘cheating’ to play music-written-for-freakishly-large-hands.
Incidentally, I read that Beethoven spanned a tenth in a bit of a stretch.