A:Answer 4k and HDR are different. HDR also Varys based on the tv itself.
4k is the resolution of the screen. How many pixels are on the screen.
HDR (High Dynamic Range) has to do with the color contrasts. It makes the blacks blacker, makes the colors more bold, and tends to intensify brighter colors. Regardless if you have hdr or not, 4k will have a sharp picture.
HDR also varies in the sense that say OLed tvs give the deepest black color you can get in an led tv. So it takes less color to achieve the larger contrast. Where as Samsung’s QLed doesn’t achieve the black levels the OLed tvs get, however it has a higher range of overall colors and tends to be much brighter overall.
There is not really a bad HDR as any 4k(UHD) tv would benefit from an HDR update.
