I have a CG246 and a CX240, and I can confirm that a CG is a waste of money unless you work with video on a pro level (I don't, but didn't know that at the time, so that's why I got it).
For photography the two are identical. The integrated sensor in the CG is nice, though...
I don't know the CG211, but I assume it uses a PVA panel? Those I do know, and while it was impressive how Eizo always managed to get those tricky panels to behave, the modern IPS variants are clearly superior in all respects. You'll mostly see it in the blacks. On my two units, black levels stay absolutely constant no matter how steep the viewing angle, whereas most other IPS panels suffer from a "glowing" effect off-angle.