There are different measures of wealth inequality, and they are going to give different results.
For income inequality the typical approach is to consider the distribution of income post-transfers by Gini coefficient. In this sense the Dutch economy has among the lowest inequalities in the world (Gini ~0.26-0.29 depending on the estimate and methodology), though still a bit worse than the most equal societies (Gini ~0.23-0.25). (By comparison, the US is around 0.40-0.42.)
wealth inequality is high
Compared to what? What it should be? Other countries? Other times? For much of history, most people weren't even allowed to own property aside from their personal belongings. Do I, personally, think inequality should be reduced? Yes. But let's not deny that these societies are among the most egalitarian in history, "corporatism" or not, and the feudal and ancient civilizations were all invariably much worse.