Korean/ Japan made
I have a Japanese RG and a Korean one:
I think the wood quality is almost the same, but the Japanese one is better built (better routings, high-end wood-cut, better chamferings etc.).
The necks are almost the same in quality and crafting.
IMHO the p-ups are NOT SO different: ok, Japaneses might be better, but NOT SO better. Korean p-ups are very powerfull with plenty of harmonics and sustain!
The Korean bridge is kinda crappy! If you got one, NEVER touch the bar! You better watch out for a used Edge and slam it on (no routings required)!!
I've put a Lo-Pro Edge on my Korean 270, and dudes... it kick-asses!
Anyway, I think there's not an high-end Korean and a low-end Japanese. Koreans are all low-end, and Japaneses are all high-end.