The professionals over at DisplayMate recently took the iPad mini with Retina display, the new Google Nexus 7 (2013) and the Amazon Kindle Fire HDX 7 and tossed them in a ring to see which tablet had the best display. Apple's iPad Mini with Retina display, while already reported to have image retention issues, lost the battle.
All three tablets had excellent ppi ratings by DisplayMate's standards, and each appeared to have "perfectly sharp" displays at typical viewing distances. However, DisplayMate took issue with the iPad mini with Retina display in its subdued ambient lighting tests, where it found it only produced "good images, photos and videos," while the Nexus 7 and Kindle Fire HDX produced "very good" image quality.
Additionally, DisplayMate only found "good accuracy" when it came to absolute color accuracy on the iPad mini with Retina, while the other two received "very good " ratings. The Nexus 7 (2013) was inferior when it came to image contrast accuracy, however. Overall, the Kindle Fire HDX 7 and Nexus 7 (2013) both received "very Good A-" scores while the iPad mini with Retina received a "Good B" score in the "overall" testing category. Apple's smaller iPad also suffered in relative maximum brightness, mirror reflections, relative contrast rating in high ambient light and other tests.
DisplayMate found all three tablets were particularly weak in brightness decreasing at 30 degree viewing angles, but that the iPad mini with Retina had too small of a color gamut and a poor absolute color accuracy rating.
The tests are super in depth, so if you want a closer look head over to the source link below.