I have the CG2730 - the 279X was not out yet. The built in calibrator on the 2730 is just good for upkeep, but the CG279X is supposed to be much better and good enough that you do not need an external device. I haven't had the experience with it though.
I really do like the EIZO, they are very accurate in color, contrast, have great uniformity and viewing angle, and have film that eliminates light bleed similar to the NEC. I see a maximum dletaE94 of 0.5 in grayscale priority (which about haves the contrast since the black point goes from about 0.1 to 0.2), and over 1100 contrast in standard mode, where, except for black, the deltaE is less than 1.
The profiling is much quicker on the EIZO than the NEC, and you can easily switch profiles in a matter of seconds. The screen also does not need to warm up for as long as the NEC for accurate color.