<p>First, the caveats. I'm partially color blind - called a medium red-green color blindness. As such, I have to make sure everything is calibrated. I have an Eizo monitor that calibrates itself. I have an HP Z3200 printer with a built in photo spectrometer to calibrate the printer to the specific paper I'm using</p>
<p>To take it to the next step, I started using the xrite photo passport - both to calibrate the sensor and as a gray card</p>
<p>Even with my level of colorblindness I've been able to detect subtle changes once calibrated. I've compared some sample's taken with 5DM2, 5DM3, 5DSR, 5DM4, and the GX9. The calibration charts pre calibration do have subtle differences, the calibration charts post calibration do indeed match. Again I'm partially colorblind, so the differences might be might higher than I'm able to detect.</p>