As stated above, 4K isn't a gimmick, but there are some competing standards regarding HDR (High Dynamic Resolution) that need to be sorted out. It appears the lower-tier version of it is winning out since both consoles support it instead of the higher-tier (and more processor-intensive) Dolby version of HDR.
But if you can hold out, wait until the Super Bowl and March Madness for getting a TV--prices are better then than on Black Friday, plus you have the luxury of seeing what shows up at the CES show in January that will be hitting the shelves later this year.