The SFZ format is the file format underlying all the Expression Engine synthesizers. This means that once you get a grasp of the format, you can transfer the underlying sound waves between any of the following synthesizers.
Session Drummer 2
Session Drummer 3
In other words, if you have a bunch of samples, then you can load them into a wide range of players and process those samples with the tools in each player.
However, the SFZ format has been adopted by other non-Cakewalk synthesizers. At the time of writing, you can load SFZ format files into products from:
… and probably more that I am ...