SDR peak brightness is great. For the most part, there's very little variation in brightness when displaying different content and you shouldn't have any issues viewing the image in a bright room setting. The 2% window is noticeably darker due to the TV's CE (frame) dimming, which can't be disabled, and may cause dark scenes to appear darker than they should.

We measured the peak brightness after calibration, using the 'Movie' picture mode at maximum brightness, and with gamma set to 2.2. Contrast was left at its default setting and contrast enhancer was set to 'Off'.