Question 4k or best HD I can get for upgrade from 32 to 49"?

Parents want a new TV, they asked me, so I am asking you...

They will be about 3m from the TV with deteriorating eye sight! Think therefore 4k maybe not worth it?

Found a good deal on this Samsung on groupon, a 50" HD smart TV for £439

They went to JL and found these:
Samsung UE49MU6400 @ £669
Panny 49EX600B @ £649
Panny 49ES503B @ £649

I was impressed at least they came back with just Panny and Samung as I did not steer them that way.

Any thoughts?
 

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