It's more than the controller. It's the samples itself. The controller is important, but it is only as good as the sound it generates. A saxophonist can change the colour and tonality of a note by tightening the lips (for example) - and so can make a tone of a note different by just holding the note. This can be emulated using programming, but it's hard to make it sound like the real thing. Also, there's the legato thing that saxophone made that's not easy to duplicate - sound-wise.
So while a person can use a wind controller, if the sound is generated from a lousy sound bank, it's useless. The most realistic samples of saxophones out there, unfortunately, do not support wind controllers. It's not impossible, but the programming is too complex, and probably not achievable.