may be possible, but S-400 is not world best SAMs as you said but Right words for S-400 is ITS ONE OF THE ONE OF THE BEST SAM IN THE WORLD, both PAC-3 and S-400 is comparable to each other in term of capabilities
but according to Wikipedia HQ-26/HQ-29 development are already completed, and waiting for induction
HQ-26 - Chinese equivalent of
SM-3 for naval deployment,
[22] upgraded HQ-9/19 equipped with a dual pulse solid rocket motor for the final stage like SM-3.
[27] Its certification is expected in 2015 at the earliest.
HQ-29 - Chinese equivalent of
MIM-104F (PAC-3) (PAC-3), with engine upgrade for the final stage: instead of a single dual pulse solid rocket motor, HQ-29 is equipped with over a hundred tiny pulse solid rocket motors mounted in the forebody of the missile,
[22] but the exact number remain unknown due to lack of publicized information. Its first flight was achieved in 2011 and it is expected to be deployed by the end of the Twelfth Five-Year Plan.
[29] At least one additional test was conducted in 2013.