Your comment makes me laugh. Arms industry isn't just tech access and transfer. Can Japan and Korea make indigenous turbofan engine? BVR missile? Stealth fighter? ICBM? SSBN? ASAT? C4ISR?
To start off, for air-to-air BVR missiles, Japan's Mitsubishi AAM-4 has longer range and data link compared to PLAAF's PL-12. As far as stealth fighter goes, I don't remember PLA has ever made any stealth fighter. Both Japan and Korea have already confirmed their stealth fighter programs (ATD-X and KFX). While Japan have already showed us the full scale model of their stealth fighter and plans to have test flight as soon as 2011, I haven't heard nor seen anything solid about the J-XX program from the PLAAF's side. Why would Japan want ICBM when they're not even allowed to have nukes, I'm pretty sure they can come up with their own ICBM design very quickly if they want to, considering their advanced rocket technology. PLA can produce large amount of military equipment at cheaper costs, but I really don't see how China's military industry has higher quality than Japan or even Korea's.