The consensus seems to be 1, 2, then paganini, then 4, and 3. I would suggest, however that 1,2, and paganini are about the same in terms of difficulty, then 4,
then 3 being most difficult. If you absolutely had to put some kind of order on them, I would say 2 is easiest, then Paganini, then no. 1, although this ranking is marginal, as all three are very close in difficulty. I really do not think that the Rhapsody on a Theme of Paganini is more difficult than nos 1 and 2, as many of you have it. If anything, it is "easier" (easier a very relative, intangible term) than at least no. 1, if not 2 as well.