For some reason (bad software support? tradition?) the PC laptop market seems to simply not care that much about extremely high resolution displays. There are some, but none in systems with the overall build quality of a MBP.
Cheap laptops don't care HiDPI displays because it's cheap. Gaming laptops less care HiDPI displays because it's too much resolution on current GPU.
Most premium models provide both FHD and 4K model, FHD is for battery life and price.