That's true. Wide Gamut Displays are much more sensible to cyan and magenta "cast" due to the higher saturated primary colours. This is why the conventional white point targets do not work for wide gamut displays unless the calibration software provides correction tables.I have heard that the AdobeRGB units have a bit of a different 'look' when compared to conventional gamut displays. Anyone able to elaborate on that?
For example: my CG241W is calibrated to something close to 5400K with Eizos "Color Navigator" (with correction tables). When I measure the white point with the same measurement device with the software "BasICColor Display 4" the measured white point is around 5000K. When I measure the white point with Quatos software "IColor Display" set to preset "LCD display" the measured white point is again around 5000K. When I set the Quato software to the preset of one of Quatos wide gamut displays the measured white point is 5800K.
This is why it is essential to use either the manufacturers calibration software for wide gamut displays or to use a spectrometer (which is the worse alternative in this particular case).
The white point thing regarding wide gamut displays is discussed in one of Eizos "white papers" that you should find on their website.
Further in a non color managed workflow wide gamut displays show sRGB files oversaturated. A thorough color managed workflow - even for the web browser - is a must with wide gamut displays.