The three Electorate could perhaps be in the list, since they were originally called as Sonatas by the -young- author, and were also included in some old-style Complete Sonatas scores.
They're far more difficult than the easy op.49, being longest and with more brave passagework. IMHO, about at the same level of op. 79 and only a little easier than op. 14/1.
I see the wonderful op.90 a little overstimated, and the Pathetique underestimated, at the contrary.