Umm forgive me but doesn't China have greater manufacturing techniques, level of technology being far advance than Turkey? And in the same breath, isn't China, Pakistan's "Premier Ally"? Then why is it that Pakistan hasn't by default approached China on such matters? Is that we have made it a habit of thinking that Chinese have inferior technology, whereas the world has come to understand and acknowledge China's prowess in technology. China has surpassed the rest of the world in Nuclear Power technology with likes of Pebble Bed reactors and fast breeder reactors.
In fact, if we were to look at the period between 2005-2018, had we considered replacing or substituting F-16s with J-10s at the time, even if it were technology information and exchange. Then today Pakistan Air Force would have been in a stronger position to go for or already have J-10CEs (who knows, we would've already have A ESA by now). Granted if funds were available, but still, I don't think we treat China with greater status of being our premier ally, than we ought to.