The Vizio P75QX-H1 has a good full-array local dimming feature. We recommend using the ‘High’ setting (local dimming is called Active Full-Array), as there’s almost no difference between ‘Medium’ and ‘High’, except that the ‘High’ setting gets a bit brighter and doesn’t crush blacks as much as the ‘Medium’ setting.
There’s some blooming around bright objects, but not nearly as much as on the Vizio P Series Quantum 2020, likely due to its higher lighting zone count. It can look a little blotchy in dark scenes with small highlights, like a star field, as the combination of blooming and crushing of more distant stars makes the screen look uneven. Unfortunately, subtitles are bright, and there’s a lot of blooming around them.
Zone transitions are visible, but not as much in regular content as when using our test pattern. It follows slow objects relatively well; however, it struggles to keep up with fast-moving objects, with the leading edge often lagging and trying to catch up in brightness.
The 65″ model has fewer lighting zones while the 85″ model has more. We expect them to perform differently.