I could not resist it, even though I'm not a Christina Aguilera's fan :-)
CXF JAXRS is catching up. Jersey is an extremely strong player, and I have little doubt about the top quality of other JAXRS implementations - but their CXF competitor has something to say on its own - right now.
CXF is there to offer a number of approaches toward building serious web services. The fusion of JAXWS and JAXRS is likely to appeal to many developers and this is just one of the areas where CXF JAXRS can play its part.