I currently have an eight year old Sony Bravia. It's 40-inches, has no smart features, and only one HDMI port. It's an LCD, I think. There's nothing wrong with it, in the sense that it's not broken. It does what it's supposed to and what it has always done. But I see deals on modern TVs and I'm wondering am I missing out on a considerably better experience. Given how much TV I watch, is it worth buying something bang up to date? Should I look at curved screens? 4K? 50-inches? 55-inches? Is the experience qualitatively better? I'm seeing decent prices and reviews on Samsungs: is that a brand you'd recommend?