A:AnswerHDMI 1.4 and 2.0 cables are the same. HDMI 2.0 is a software difference in both the TV and the device you're attaching, so the hardware is pretty much the same. Any 1.4 cables with high speed ethernet will do HDMI 2.0 functions.
There's a good resource on the HDMI organization website (HDMI.org)
http://www.hdmi.org/manufacturer/hdmi_2_0/hdmi_2_0_faq.aspx
A:AnswerIt depends on what is being played. I have the exact setup and if I’m on YouTube watching a 4K video it’s great but on regular tv and Netflix before I upgraded to 4K it’s not as good. But it’s not the cable it’s what’s being played. Regular cable doesn’t offer a lot for 4K yet. That’s why some things look better than others. If you use Netflix be sure to upgrade to the ultra HD version for $3/mo for that super crisp experience.