When you watch a 4K TV, more often than not you're not actually watching 4K content -- broadcast TV, the vast majority of YouTube and Netflix, even Blu-ray video is a long way off the top quality able to be displayed on a high-end 4K HDR display. The secret sauce in Sony's new Z9D 4K HDR Android TV -- that's a mouthful -- is a new imaging processor that is 40 per cent more powerful than the previous generation, enabling some software tweaks that intelligently detect objects in video and adjust colour and contrast appropriately.