Literally just got back from a r/t to Chengdu, ex-EU on MU/FM.
Longahul flights on 789s, domestic flights (PVG-CDU / TFU-PVG) on 77W and A321, respectively.
All flights in J, but got upgraded to F on the PVG-CDU domestic leg.
Not sure about legroom in Y but in J it was about as expected from a "legacy" carrier. Nothing to write home about.
The 789s (still under FM livery) have a variant of the Thompson Vantage XL onboard (read - very similar in size and functionality with DL's A350 Delta One Suites).
The 77W we flew had Safran C2s in J and some modification of the Stelia Aerospace seat used by AF in F (the old version of LP).
The A321 had surprising 20J155Y config with some Recaro seats in J with electric / motorized controls.