I think that there are a lot of really tough prewar sets out there, but since they are not widely collected like the 1914 CJ's, it's difficult to tell how rare they really are. For example, I think the W519 Numbered Type 2 and W590 Master set are really difficult to complete. However, if each card in these sets went for $1000+ like some of the difficult cards from the CJ's, perhaps a lot more of them would appear. Because of lot of these cards from these sets sell for less than $50, there is not great demand for dealers and collectors to scour their inventory to see if they have these cards and put them for sale on ebay or at an auction house. Other tough sets include E121-80 (and not including the back variations), E121-120, E122, and E220. I'm sure that there are plenty of other difficult sets. Still, I think the 1914 CJ's is one of the most difficult with a large number of collectors actively spending $$$$ to try to finish.
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