I commend this important paper in Utilitas by one of our PhD students, Joshua Fox, who is defending his splendid dissertation on pessimism in Mill, Schopenhauer and  Nietzsche next month.  The paper, which draws on dissertation material, sheds fascinating and new light on an aspects of Mill's ethics that I've not seen addressed before.  (A different part of the project, related to Nietzsche, is found in this paper, which Nietzsche scholars will want to read.)