No F between NRT (or KIX) and China on JL (or ANA, for that matter).
I've done several NRT/KIX-PVG flights in J and the service is quite good. JL usually uses 777s or 744s ex-NRT and 763s ex-KIX. I have seen 767s used ex-NRT as well (am on one PVG-NRT next week).