In the course of our tests, readers occasionally ask us which camera displays the truest color, but we do not normally specifically test for this, only mentioning it if one model displays extreme issues (blue tint, desaturation, etc.). It also varies from monitor to monitor due to differences in calibration, so it's more complex to pin down.
However, I'm curious. In your everyday experience, how often does trueness of color become an issue? Obviously, if something is yellow and displays as green, it's an issue. However, does recognizing something as "blue" usually suffice? Do you need to know it something was emerald green instead of kelly green?