The eggheads at DisplayMate have taken a good, hard look at the Samsung Galaxy Note 5's display, and they like what they see. The company rated the Note 5's display as the best it's ever tested in multiple categories, dethroning the previous record holder, the Note 4.
The screen in question is a 2560x1440 AMOLED unit with "diamond pixels" and several baked-in color calibration modes. DisplayMate praised the Adaptive Display mode, which it claims covers 134% of the sRGB color gamut. Although it's highly saturated, this mode is useful for outdoors viewing where the increased saturation is claimed to make the display more readable in bright sunlight. Speaking of which, the Note 5 can get as bright as 861 cd/m² when set to automatic brightness, making its screen the brightest display DisplayMate has ever tested. Likewise, the contrast ratio in high ambient light is again the highest the site has ever seen on a mobile device.
If you're staying indoors, you can leave the screen in the Basic mode, which is claimed to be equally impressive. This mode conforms closely to the sRGB color gamut, with a color accuracy of 1.4 JNCD (Just Noticeable Color Difference), which DisplayMate says is "is visually indistinguishable from perfect, and is very likely considerably better than your living room TV."
Last but not least, a particularly interesting fact is that the Note 5 manages this performance while using less power than the Note 4 in DisplayMate's tests—21% less. The company also says the Note 5 is 37% more power-efficient than the iPhone 6 while viewing a mix of text, images, and movies.