Originally Posted by STN57
Differences that I know of is 120hz compared to 240hz and the w850a doesn't have the "deep black panel" whatever that is.
From the Sony site: "Discover other screen technologies from SonyDeep Black Panels – vibrant colour and contrast. Choose a BRAVIA TV with a Deep Black Panel and you’ll notice th difference in your whole viewing experience. The panel has a low-reflective, clear surface which helps deliver high contrast, realistic detail and accurate colours. Keep your eye on the action with no distractions and no ‘wash-out’ effect on the picture when light from lamps or the sun hits the screen."
The W850 presumably has the downscale Opticontrast panel: "The TV ‘panel’ is the layer between the TV backlight, such as LED, and you, the viewer. How this is constructed has a significant impact on picture quality. OptiContrast Panels have a special resin layer which absorb any diffused light delivered from the backlight. What you see is high contrast and natural colours on screen – bringing out detail in the darkest movie scenes – and a real sense of depth.
This special resin layer inside OptiContrast Panels also absorbs ambient light in the room. When watching TV, it reduces glare from light sources such as lamps or sunlight. Turn off your TV and you have a beautiful surface to enhance the room – it’s part of our Monolithic Design concept."