At 40 inch most think 4k adds no value. If you are looking for a quality 40inch full HD smart tv look at this !! Sainsburys special purchase just arrived in-store at £290. Web search will show it is highly rated, What-TV of the year for its size. Purchased today at that price, not worth the extra £110 to purchase the 4k Sammy J series. Out of interest same promo has brought in a Sharp 48 inch at same price, detail not known as too big for my need. Panasonic soundbar at £50 and other items of similar interest.