One day, as a student — or so the story goes — Egon Schiele called on Gustav Klimt, a celebrated older artist, and showed him a portfolio of drawings with the abrupt query, ‘Do I have talent?’ Klimt looked at them, then answered, ‘Much too much!’ One gets an inkling of what Klimt was getting at from the feverishly intense work on show in Egon Schiele: The Radical Nude.