Do you mean the Feather Artist Club? The Artist Club uses special blades that are designed to fit it, there's no plastic adapter like the shavette uses so you can't use DE blades (although you can apparently use Schick Injector blades though they're a bit short).
Anyway, you can use Feather DE blades in your shavette, so technically the answer is no, it's not sharper than a Shavette. But the feather blades (both DE and Artist Club) are *much* sharper than the Merkur blades that I think you've been using, so the feather AC is with feather blades is much sharper than the shavette loades with solingen blades you mentioned.
The Feather AC is much heavier and more solidly built than the shavette - it is weighted like a straight razor. Unfortunately it is also much more expensive than a shavette, though the blades themselves are pretty reasonable, about the same price as Merkur DE blades are over here, and they last a long time - most guys seem to get about two weeks of shaves out of an AC blade.