Local multiplayer on PC? Anyways, a 4k 55" TV your seating distance needs to be between 3.7-6 feet away provided the content you view is in 4k as well. Like getochkn said, 4k requires a really good PC. If you still want to go with 4k then what is your budget, did you find any TV's you could link to us? Because resolution is not the only variable when shopping for a new TV, contrast, color, saturation, seating distance all play equally big part to get the best for your money.