Yup, we had a Mitsubishi High-Def TV that we thought was amazing with its 1080 lines. A couple years ago while walking through Best Buy I glanced over at the TV's and was absolutely stunned by the 4k resolution sets. It's like looking through a window. It's up-scaling system can make 50's shows look like they were filmed today.
While still a little expensive but decreasing, a 55" 4k Ultra-High Def will blow you away. Along with a decent audio surround system, there is no need to go to a theater anymore. We still comment on how amazing the picture is. Also, they are called "smart TV's" because you can stream directly from your router placed anywhere in your home. And talk about adjustments...sheesh.