I have a 65" vizio 1080p 3D TV from 2014. This game looks amazing on the TV.

Be sure to enable native 4K video playback in your One X settings (Display->Video Modes). The Supersampling is impressive.

Also set your video output to HDMI instead of Auto Detect. Then select 1080p (The console allows you to set resolution to 1440p even with a 1080p TV but everything appears slightly blurry and with significantly less black detail)

Then you can start playing with your TV settings. (no motion blur, no noise reduction, >=80% contrast, >=75% sharpness, game mode on etc.)

Honestly the quality of picture looks better than every 4k gameplay video people have uploaded to youtube. This is after the capture cards and youtube compression turn the footage into garbage.