Yes a PS3 looks good on a 4K TV....whatcha playing today : r/PS3
Amazon.com: PlayStation 3D display : Video Games
RCA to HDMI, Coolmade 1080P Mini RCA Composite CVBS AV to HDMI Video Audio Converter Adapter Supporting PAL/NTSC with USB Charge Cable for PC Laptop Xbox PS4 PS3 TV STB VHS VCR