Display measurement experts from DisplayMate already tested the new display (with a pre-production GS9), and published a comprehensive report. As expected, Samsung continues to improve its OLED displays, and the GS9 again is announced by DisplayMate to be the world's best ever mobile display, better than the iPhone X OLED.
The display may appear to be very similar to the OLED used in Samsung's 2017 Galaxy S8, Samsung did implement some major display performance improvements. DisplayMate explains that in the GS9 Samsung concentrated on significantly enhancing and optimizing the on-screen absolute picture quality and absolute color accuracy of the OLED display by implementing precision factory display calibration.
The GS9 matches or sets several display records, including absolute color accuracy that is visually indistinguishable from perfect, and the smallest shifts in brightness and color with viewing angles. The GS9 is also 20% brighter than the Galaxy S8, and it earned DisplayMate's highest ever A+ grade.