Is the BRAVIA 8 OLED worth it over a cheaper OLED?

It brings Sony's processing and Google TV to a 55-inch OLED. If you mainly watch streaming apps and want deep blacks, it is a strong pick. If you need the brightest picture or 4K at 120Hz for gaming, a brighter OLED or an HDMI 2.1 set fits better.

Does it support 4K at 120Hz for gaming?

No. The listed HDMI ports are HDMI 2.0, so 4K tops out at 60Hz. It does have a game mode to cut input lag for consoles.

The TV, a remote control with voice control, batteries, a power cable, a USB Type-C cable and a quick installation guide.

Does it need a streaming stick?

No. Google TV is built in, so Netflix, YouTube and other apps run on the TV itself. Chromecast is also built in for casting.

Can I mount it on a wall?

It is a 55-inch set weighing about 18 kg, so a wall mount rated for that weight works. The box contents list does not name a stand or wall bracket, so check what your unit includes.

How does it compare with the BRAVIA 9?

The BRAVIA 9 is a brighter LED-backlit set with more dimming zones and higher peak brightness. The BRAVIA 8 is OLED, so it wins on black levels and viewing angles but gives up brightness.