I bought a UHD TV at the weekend (Samsung QE65Q60R). It already has Prime Video pre-installed and I think I can enjoy certain content in UHD. If I only want UHD and good sound, do I need the Fire Stick 4K at all? In other words, I can get both via the pre-installed app on the TV, can't I? I'm not sure whether the output is really displayed as UHD or not. Thank you :)