Here is XDA review of Samsung S10 display: Samsung Galaxy S10 Display Review: An ambassador that Android needs

The introduction to this review is important to read:

"Everyone says it: “Samsung makes the best displays for smartphones.” It’s widely regarded as truth and not many try to dispute it. Even fewer try to (or even know how to) individually assess the display. The problem with this is the lack of verification from what is seen on publications (including our own) versus reality and the limited number of valid points of views and shortage of expertise on the matter. What many don’t know is that previous-generation Samsung Galaxy displays did have issues and even lagged behind the competition in certain categories such as color/white point calibration, gamma, and black clipping. They were not perfect displays — they were far from the best in terms of calibration, actually — and most display reviews gave them way more praise than they deserved. Many are also misinformed and claim their displays to be color-accurate when in their default oversaturated profile."

Here are quotes from the review:

"Samsung does a decent job with color accuracy with their standard reference profiles, but the Galaxy S10 continues Samsung’s warmer calibration trend that plagued their previous handsets, still placing it behind other displays like the iPhone X(S) and the Pixel 3 (XL) in color accuracy.

The viewing angles on the Samsung Galaxy S10, at a 30-degree angle, are the lowest we’ve measured so far. The shift is still non-uniform and sudden at acute angles, and still noticeably varies between shifting towards red and shifting towards cyan. It is also always visible on the curved edges of the screen on lighter/white content.

Black smearing is identical to previous generation panels, while black clipping (black crush) has improved (lessened) with the Samsung Galaxy S10. The Galaxy S10, however, is still inferior to OnePlus’ latest handsets in black clipping, and outclassed by the iPhone X-series panels in both these categories.

However, the Samsung Galaxy S10, and any other Android for that matter, should still not be used to professionally edit color-sensitive photos or videos, since photo editor apps with working color management support are still non-existent on Android. This is still best left to Apple devices, including iPhones and iPads.

Ultimately, the balance is best found by tackling it with hardware, like how Apple does with their resolution-specific panels (with higher default PPIs than Samsungs’), but this removes the option for the even-higher resolutions that Samsung provides. Some may find the default option underwhelming while finding the higher resolution overkill, but with no intermediary options, some may find Apple’s approach to panel resolution superior.

As I mentioned in the beginning, Samsung’s panels are not perfect, and the Galaxy S10, too, was revealed to have flaws throughout my review of it. From a purely display-geek and professional calibration-driven point-of-view, however, the iPhone XS is still the superior display package, with textbook ISF calibration at any white level with the least drive variance, superior shadow rendering/black clipping and subpixel response time control, and the company leader in color management support and understanding in colorimetry, receiving the higher A+ grade."



And here is review of Pixel 3 display:
Google Pixel 3 Display Review: An Improvement, Yet Still Behind the Curve

"We would give the Galaxy Note 9 an A rating: Very good brightness with high brightness mode, great gamma control, photos app has some color management. But, it still has black clipping, and we found the color accuracy in the calibrated profiles to not be too impressive. The iPhone X and the iPhone Xs both receive A+ ratings: It has a stellar manual brightness range without utilizing high brightness mode, zero black clipping over its 8-bit intensity range, smart PWM control, the best color accuracy we have measured, good gamma control, and excellent color management with an OS that utilizes wide color. These very noticeable and experience-affecting differences allow it to pull ahead of the Note 9 based on the qualities of the display and how its software handles it...."