Okay I just ran the new iOS 14.5 / tvOS 14.5 color calibration on my Sony Bravia XBR49X800H 2020 4K TV.
I used the Cinema color setting option because most experts say that is the option which Sony claims is the closest to the best out of the box calibration. In other words, it is supposed to be the most color accurate. The ATV color calibration feature appears to have made a very slight change by making the picture a tiny bit warmer. Other than that I cannot see any obvious changes. However, the Sony Bravia TVs do have a reputation for really accurate color calibration out of the box. It will be interesting to see if this makes a big difference with a TV that has poor color calibration.
BTW, the ATV color calibration showed me the attached beach scene to illustrate the before and after differences. However, that is perhaps the absolute worst scene to use as the sandy beach has almost no frigging color in it! Apple really needs to think through what they are doing. I snapped this photo of my TV using my iPad Air 2020 and made no color adjustments to it. Comparing the photo to my TV set after the color calibration it does appear that the sand on the left is slightly warmer in color. Apple really should use a better image though that will well illustrate any changes.
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