The Leonardo at the National has drawn record crowds and till receipts for the Exhibition and subsequent purchases in the book shops have topped £60k a day so at this rate the overall income from it will be around £5.5m plus sponsorship from Credit Suisse.
As to the exhibition itself, I found it disappointing. The sketches are so hard to see (and so small) and the bigger portraits such as Christ as Salvator Mundi and The Madonna of the Yarnwinder seem to be less by him and more by other artists.