I do wish that the local Costco store would stock the Samsung UN75F6400 set...that one does seem to be better from what I have read. I am looking to upgrade from a 4 1/2 year old Samsung 55 inch TV.
You were incorrect about the hz or refresh rate if it is a 720 refresh rate it is the 240hz
the 240 refresh rate is half which means it was only 120hz so that could have caused the poor picture.
At the Costco in Burbank CA both had a great picture....so I ahd to do my homework and found out that the 75 inch was only 120hz.