Let the chinese get the j20 in service first mate then they can make jf17 into stealth
it isn't a as stealthy as a fifth gen, but a reduced RCS making it stealthy.
Block II will have AESA or PESA,a system similar to JHMCS, SD-10B(supposedly superior to the AIM-120C-5), IRST, an improved ECM/EW suite, WS-13. Maybe even RAM coating.
Plus the DSI, glass cockpit and an already good enough ECM that beat the F-16s best ECM variant.
Put all that together and it becomes just as good if not better then the F-16 block 52