But you have to bear in mind that TV picture quality unless you use rigid scientific techniques is very subjective.
Well the best judge of a TV picture is who is going to watch it IE you.
If you don't like it,then no amount of persuasion will tell you otherwise.If you have ten televisions then you have ten different TV pictures due simply to the variations caused by mass production.
My advice is to choose a god friendly local firm not your large superstore who simply want to knock out the latest make and model rather than a TV that suits you.
Smaller companies have more time for their customers and some may even let you have the set to try in your own home for a while,and even you find you are not happy with the picture may even let you swap it.
Service like this doesn't come from bigger companies