That could be a very big talk! 
To make the talk straightened, lets 1st round out S.korea,
because, it got weaker power and S.koreas standing is more
neutral, actually, IMO, the F15K is more a threat towards japan
than china, Because, Japan dont enjoy the defense depth that China
prevails, and also, if China being struck by S.koreas F15K, it can
easily knock out the airfield where the F15K launched by using all
kinds of missiles including cruise missiles which japan
lacks.
So regarding Japan and China, the topic becomes more realistic. On
paper, Japan got better Navy because it has more and better surface
ships! But think again, lets see what currently happened at the
hotspot (again where got oil) in East China Sea. The China side
already start drilling oil without any funfair talk ( we only see
Japan makes a lot of noise if u turn to the news tonight), only the
PLAN vessels are around the scene instead of Japs more high flied
9.10 fleet. How come a country with supposed to be more powerful
navy got weaker politic demanding, Dont talk to me because
somebody is more civil or polite such kind of story. Because the
thinking Japs got better surface navy then is more powerful is
wrong.
9.10 fleet yes got better airdefense than any PLAN fleet at the
time being, however, Japs SDFs antiship projection is mainly only
relied on Harpoon ASM launched from navy vessels and their airborne
Harpoon capability is very poor( F15J cant shoot ASM).
The harpoon Anitship missile itself is not so advanced compared to
many supersonic/longer range ASM in PLAs inventory. The US Navy
use Harpoon very simple. Their ship borne F/A18s just shoot ur
fleet use huge amount of Harpoons at the same time to saturate your
fleet air defense.
Then lets c what going to happen if the japs 9.10 fleet at the
conflict spot really encounters PLA force.
The PLA will use the same tactics that US navy CV groups are
applying: many long haul land based Su30/JH-7 heavy fighter bombers
will launch standoff missile attacks towards the fleet. At a full
load anti-ship config. Its said, a PLA 1st class Naval Aviation
Regiment can shoot 400-500 ASM simultaneously. So no matter how
strong the 9.10 fleet is, it just cant stand such a saturated
attack. In real practice, the PLA most likely will mix their
Antiship missile like YJ83/K59A with their anti-radiation missiles
like YJ91/ K31 etc. making the punch more deadly.