Indeed? How do the Schubert sonatas compare in terms of technical difficulty to let us say: op. 90, op.57, op.101 or op.106 (where would you place Schubert in general, and does any sonata come in the near of Hammerklavier)? Or to the Wanderer-Fantasy, if you are familiar with it? And which of them is hardest, and which is your favourite?
I have only a superficial knowledge of the Schubert sonatas and want to change this.
Schubert's D Major sonata is generally considered the most technically difficult, and I'm sure it would be in the top six or seven of Beethoven sonatas, ahead of Op. 90, 110 and maybe 109. In terms of technically difficult, the C Minor D.958 would be second and around the same when compared with Beethoven sonatas. And, mind you, a lot of Schubert's "technical" difficulties are the consequences of insane things like seven note chords that are marked pianissimo. Schubert, like Mozart, requires perfection of tone production, while Beethoven does not (a lot of the time), and it just so happens that Schubert sonatas are about three times longer than the Mozart sonatas.
I'm pretty sure the Wanderer Fantasy is more technically difficult than either the D Major or C Minor sonatas, and probably comparable to 111, but don't quote me on that.
Anway, I'm not too well versed in the Schubert sonatas either, so if anyone else wants to contribute...