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It's not a matter of better or worse, the actions are completely different, by design. It's kind of like comparing a motorcycle to an SUV. They'll both get you from point A to point B, but neither is better or worse than the other, it's a matter of what you need. The PX5S has a hammer-style weighted action, designed to feel like a piano. The MOXF6 is a light synth/organ style action, which most people find superior for those uses, but it's pretty bad for playing piano (as the PX5S action is pretty bad for playing organ). If your focus is on piano, you would compare the PX5S action to the MOXF8, not the MOXF6, because at least they are designed for the same purpose (and in that case, I'd say that the Casio has the better action). Personally, I think MOXF6 sounds much better than the PX5S overall, but if I were buying one of the two primarily for piano playing, I'd buy the PX5S.The keybed of the PX-5S is superior to the MOXF6, but if the MOXF6 does have a half-way decent feel to them I might well go with that model.
And yes, the PX5S makes a great controller for additional, external sounds (from a rack unit, laptop, iPad/iPhone, or additional keyboard). So sure, you can improve the sounds you can get from the Casio, but there's nothing you can do about the action of the MOXF6. So if piano is a focus, as much as I like the MOXF, I think the Casio would be your better choice.
As for PC3LE vs. MOXF, the Kurz is still stronger in some areas, like clonewheel organ and VA synth, MIDI controller functionality, aftertouch. I also prefer the EPs on the Kurz, and maybe the strings. OTOH, for most sounds, I prefer the MOXF to the Kurz, and you can load more sounds into the MOXF via a flash card. It's also a lot easier to carry around.