I was highly disappointed by these results. Like I said earlier, we've seen great improvements in the quality of AMOLED displays as of late, and Google took color calibration very seriously with the Nexus 5. The Nexus 6 shows significant regression in color accuracy from the Nexus 5, and the maximum brightness is much lower. It should also be noted that despite its higher resolution, its larger size means that compared to the Nexus 5 the pixel density only increases 12% from 441 PPI to 493 PPI. The use of a PenTile RGBG subpixel layout also means that there is actually an overall decrease in subpixel density.
Overall, the Nexus 6 display is quite poor relative to the displays on other smartphones like the Galaxy Note 4, iPhone 6, and HTC One (M7). It's also a definite regression from the display on the Nexus 5, which is concerning given the fact that the Nexus 6 is $300 more expensive. It has been speculated that Motorola is unable to source the latest generation of panels from Samsung Display, which would explain why many of the panel characteristics are similar to previous generation AMOLED panels in the Note 3 and Galaxy S4. Although the efficiency of AMOLED displays when displaying black helps to reduce power usage with features like Ambient Display which wakes up the phone when notifications arrive or it is picked up, I don't believe it's worth the trade-off if it involves such heavy sacrifices in color accuracy and brightness.
