The Eizo SX is a fantastic, professional-grade monitor in itself. But the calibration solution for the FlexScan models is a lot simpler than the one that comes with the ColorEdge models. It's perfectly functional, but with limited options.
So if you really want to compare apples to apples, it's NEC PA vs. Eizo ColorEdge. And between those there is a price difference, which is not dramatic in Europe, but as I understand it quite substantial in the U.S.
IOW, you'll probably get more value for your money with the NEC.