You may have a quite small TV, or seat quite far from it, or need to get your sight checked. Perhaps it’s time to wear glasses or changes your glasses. I used

You may have a quite small TV, or seat quite far from it, or need to get your sight checked. Perhaps it’s time to wear glasses or changes your glasses. I used to not care about 4K but after I got my eyes sight fixed, 4K against fullHD is quite easy to distinguish. I’m not sure it’s worth the price bump though.