Good SDR peak brightness, a little brighter than the LG B6 and C6. The TV remains at a consistent ~380 cd/m2 for all content except extremely large and bright images like our 100% white window, which unfortunately dims quite significantly due to the TV's Automatic Brightness Limiter (ABL). This means that almost all scenes in SDR content will have a good brightness, but extremely bright scenes may dim.

The TV dims over time when showing a static image, but this won't happen during video. A plot of SDR peak brightness over time can be found here.

Update 04/24/2017: ABL is less of an issue if the OLED light setting is set to 35 or less, where the fluctuations between scenes will only drop by 20 cd/m2 or less.