Comparison of JPEG Sampling Factors

So a small image quality test for different values of jpeg:sampling-factor in ImageMagick.

Original image - Hakamada Test. Image size is 836 Kb.

Used php-imagick extension. The image was opened, jpeg: sampling-factor was set and the image was saved with 50% quality.

The results, in comparison, indicates the sampling factor, size of the image. Shown single fragment of the image (color distortion):

JPEG Image Sampling Factors Compare

As you can see, the difference between 4:1:0 and 4:4:4 is as huge as 31KB (it's only 3.7% relative to the size of the original image).

Therefore, is it so important to win so little in size and lose so much in quality as it is?

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