Well, distribution is still going, and will be going for a long time.
To compare:
In Bitcoin 0.48% own 67.28%.
In Litecoin 0.61% own 78.23%.
The difference is, in NXT original stakeholders are selling their stash, and distribution gets more even while the price is cheap.
In PoW currencies, those who have more money to invest in latest and greatest ASICs get most of the coins, hence the distribution is getting more distorted.