The brightness drops considerably, with real scenes measuring at 498 cd/m². If that's distracting for you, we measured the brightness with the Peak Luminance setting disabled. The Automatic Brightness Limiter (ABL) is less aggressive, and the most notable changes are in the 10% windows, which are much brighter. The EOTF follows the PQ curve perfectly, but the roll-off is quite sharp, which causes the loss of some details in very bright scenes. Sony X90J has good HDR brightness, which is a significant improvement over the Sony X900H, and is enough to make highlights stand out. We performed this test with Auto Local Dimming and Peak Luminance set to 'High'. Blooming around the FBI text is quite bad, but subtitles aren't as distracting because the entire bottom row lights up, making the blooming around them less noticeable.
These issues are much more visible when viewing at an angle. That said, there are some scenes where it's very obvious, as it causes a haloing effect around moving people and makes some scenes look foggy or hazy. Blooming is very noticeable with our test pattern but less so in real scenes. There isn't much black crush, and small highlights still retain a good amount of details. It seems to light up a zone a little too early in anticipation of the incoming object, and it's a bit slow to turn off when the object leaves the zone. Zone transitions are very visible with our test pattern, but not as much in actual content. There are 24 local dimming zones, and the zones are pretty large. The Sony X90J has a great full-array local dimming feature, but not quite as good as the Sony X95J. We reached 857 cd/m² in the 10% window with these settings. If you want a brighter image and don't mind losing image accuracy, set the Picture Mode to 'Vivid', Brightness and Contrast to max, Color Tone to 'Neutral', Auto Local Dimming to 'High', and Peak Luminance to 'High'. We measured the SDR brightness after calibration in the 'Custom' Picture Mode, with Brightness at max, Contrast at '90', Color Tone set to 'Expert 1', Auto Local Dimming set to 'High', and Peak Luminance set to 'High'. We suggest leaving Peak Brightness on if you want the brightest screen possible with an accurate image. Scenes are more consistent, with most windows measuring between 468 cd/m² and 479 cd/m², but there's some frame dimming in the 2% windows, with both peak and sustained at around 349 cd/m². With it off, we measured the real scene brightness at 442 cd/m². If that bothers you, you can disable the Peak Luminance setting. The most variation is with the 10% windows, which are significantly brighter than the rest.
Even though brightness varies a bit between content, it's not that distracting. It's slightly brighter than the Sony X900H in the real scenes, and it's enough to combat glare in most well-lit rooms. The Sony X90J has impressive SDR brightness.
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