Interesting! I also found this article "Japanese Wrestle With CEO Pay as They Go Global".
It would seem that in the past, traditional Japanese companies paid very little, comparatively to western corporations, to their management staff. However, as they invest in overseas corporations, or as overseas corporations invest in them, they are having to deal with the economic realities that talent flows to economic incentives.
In Japan, more companies are trying to hire European executives. As such they are spending more and more on CEO pay. The article I read, explained that Nissan was near bankruptcy when a french company got control, and replaced the traditional system, with a more western pay and bonus system. The result was that unlike other companies that remained flat, Nissan has returned to the black and is competitive again.
Another thing noted was that when Japanese companies take over foreign corporations, the higher management staff tends to vacate, which is exactly what conservatives have been saying about attempts to limit executive pay.
Liberal ideals always sound good in theory, but in practice are a failure.