Reviews for some of the most popular 4K TVs as of 2016, such as the Panasonic TX-65CZ952 and LG 65EF950V models, typically praise the picture quality and compare the shadow quality and contrast level to those of plasma TVs. The reviews also mention the operating systems and the overall design as favorable; however, they criticize the cost of higher-end models, limited brightness levels and occasional lighting glitches.
For the Panasonic TX-65CZ952 model, the review on TechRadar.com praises the TV's multiple HDMI connections, all of which are capable of conveying a signal of 60 frames per second at 4K resolution. The latest firmware updates also enable support for reproduction of high-definition content from USB drives and online streaming services. The review also lauds the use of OLED technology, which allows the TV to produce accurate black levels without sacrificing color intensity and overall brightness. As flaws, the review lists the curved screen, which results in inconsistent lighting near the edges; the price point, which exceeds $10,000; and the lack of Panasonic's Firefox OS.
Reviews praise the webOS of the LG 65EF950V model for its responsiveness, customizability and interface. Other pros of this TV model include its ability to reproduce vibrant colors and high luminance, although TechRadar.com mentions that it fails to match the luminance level of other models such as the Samsung JS9500 SURD. The reviews also indicate that the screen displays shadowy effects during bright scenes and mention its inability to maintain black levels at all times.