If you read the calibration section, we spoiled the surprise. So let's start with HDR picture quality, specifically
GZ2000's ace up the sleeve in the form of higher brightness. GZ2000 is the first OLED TV capable of hitting 1000 nits peak brightness. It can maintain this level of brightness up to a 10% window (10% of the screen area), while it drops to around 630 nits with a 25% window. To put that into perspective, Sony's latest
A9G OLED has peak brightness of around
650 nits.
You may be wondering if it even constitutes a difference and yes, it does.
Comparing GZ2000 side-by-side to a Sony OLED, GZ2000 packs serious punch. It is clear that GZ2000 is capable of maintaining a high brightness level with larger coverage area than other OLED TVs on the market today. Together with pixel-level luminance control it is an ideal partner for HDR video.
Furthermore, GZ2000 adheres almost perfectly to the reference EOTF curve from start to end. Panasonic has opted for a modest roll-off; almost a 'hard clip' at the top end. This does not leave the panel with much headroom to resolve highlight details in content mastered to brightness above 1000 nits, which also brings us to our main point of criticism with GZ2000 (yes, so you can skip to the end after this). In highlight details we spotted occasional banding effects, mostly visible in sunset scenes (as seen below). If you look closely at the details around the sun (please ignore that the camera struggles to capture the full dynamic range), you will see some hard gradient transitions.