For that, you would need a Sarcasm Index.
Luckily, we live in an empirical age. Richard L. Hasen, a law professor and political scientist at the University of California, Irvine, has developed the necessary tools.
Justice Scalia registered 2.78 on Professor Hasen’s index, dwarfing the showings of every justice he has served with. Justice Samuel A. Alito Jr. came in a very distant second, at 0.43. Chief Justice John G. Roberts Jr. and Justice Sonia Sotomayor did not even register.