The 4Ks are going to be faaar more affordable than the soon-to-be-relased 8K OLEDs for the next 3-4 years .Whoa didnt know 8ks were on the near horizon. Most like 4k for me.
I went from a 55EC9300 to a 65C6P - between the larger screen size, the higher definition / smaller pixels, and the ability to display HDR, it"s a very worthwhile upgrade.
Plus I'll bet you'll be able to pick up an entry-level 65" 4K WOLED for less than you paid for your 55EC9300 . [assuming you are a prudent shopper and wait for the November pricibg 'dip' to purchase yur OLED TVs]