So for those others who might be interested, I will summarize the above comments....
Refresh rate and lag are important considerations, especially for gaming.
Strong Ethernet signal is important if streaming 4K content.
HDR is important especially for 4K blue ray and streaming 4K comtent.
I think I read somewhere that all 2017 4K TVs have HDR...
LG - seven positive comments, 0 negative comments. LG seems to be at the higher end price wise and of course many comments referred to the OLED technology.
VIZIO - five positive comments, 5 negative comments. Positives were mostly good TV if you are more cost conscious.
SONY - two positive, one negative. Not much play for Sony
SAMSUNG - eight positive two negative. Seems that most are happy with their products aside from some reliability issues.
Thanks to you all for your feedback.