Apparently the smaller 3 has different calibration profiles then the 3XL
https://www.reddit.com/r/GooglePixel/comments/9ou1dp/pixel_3_apparently_has_worse_screen/
That would explain the difference seen in the review. My Best buy display units do have a noticable difference between the 3 and 3XL. Both still looked excellent but the smaller 3 looked more saturated. What I didn't see was a noticeable difference in off angle viewing which would be a clear indication of a different panel supplier.
I wonder why Google would calibrate the same profile (in this case, Adaptive by default) differently on the two models? Shouldn't the Adaptive profile on the 3 be the same as the Adaptive profile on the 3 XL? Strange choice...
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sadly, this is what I saw on the display units at Best Buy the other day. the P3XL had a gorgeous, flawless look to it in color and saturation (IMO) but the P3 had a slight pink hue across the whole display, similar to the pic in your post. Both were set to the same Saturated display setting I believe. Sample size = 1 for me but discouraging to say the least. Let's hope this phenomenon only affects a very small sample size
Luckily, most of us won't have the 3 and 3 XL both at the same time on hand regularly to notice the difference, but it is odd. All reviews have said both models have great screens, so I think this is something we can let slide. I'll have to see when my device arrives.
I just hope it's also a Samsung panel in the 3. Wish we could get some confirmation on that. I don't know why no one is confirming it.