Going to prove the point that manufacturers haven't got much hope of getting it right and no matter how much debate, we will never be sure if colour & shade will be correct.
When I was a working photographer back in the days of film: if I was was working outside, away from a studio where lighting and colour temperature could be, to a certain degree controlled, one of my main tools (if time allowed) was a Minolta Color Temperature meter, the readings from which was used to select the colour temp, of film stock to use. You would be amazed at the variation in colour rendition, even on a bright but overcast day.
Although digital has afforded us way greater dynamic range, I wonder how many of the "comparison" images up thread were taken following a simple white balance or 18% grey determination or just taken with the camera on auto settings?
P