re: PLAN Type 052 Class Destroyer
I don't understand what this fascination with comparing the PLAN against the combined Japanese and South Korean navies is about, I don't think it makes much sense. With the way relations between the three are at present, the South Koreans are more likely to side with the Chinese to fight the Japanese than the other way around.
In addition, it should be noted that China has massive long term advantages because their ships are 100% indigenous while the Japanese and Koreans need to import key systems, and more critically, munitions from the US.
In peacetime, these imported systems are a massive drain of resources because of the profit margin the exporting companies are making, and that is money that is flowing out of the economy so is a net loss to the economy. You can see that in the rate of construction of new warships. In addition, for China, warship construction serves a similar purpose as stimulus spending in that it boosts the economy in addition to the military, that is why we are seeing such large orders for new ships from the PLAN in recent years, as they step in to provide some demand to help cushion the impact of the global downturn and massive drop in civilian shipping orders. That is simply not an option, or at least, does not work as well for South Korea and Japan. That is why you tend to see a slowdown and reduction in military orders in South Korea and Japan when their economy are sluggish, while opposite is turn with China. On top of that, Chinese military spending will naturally pick up when their economy is doing well.
In war time, the need to import munitions could be a massive achilles heel, since nations tend not to keep large stockpiles of expensive imported munitions in peace time, and the supply chain to these weapons would be unlikely to be as responsive to emergency demand as it would be the case if those plants were making munitions for their own countries. That is assuming that munitions deliveries will even take place after hostilities have broken out.
So, in the long term, the growth potential of the PLAN is significantly greater than that of Japan or South Korea's navies, and the only realistic question is not whether, but when the PLAN will surpass them, what purpose does arguing about precisely when that might happen achieve?