Eh, I have a Hero 4 black. And if you as the other commenter only think about resolution it can look like that, but the difference is enormous.

4k on a gopro 13 is far far far clearer. And the stabilization is night and day. Half my hero4 videos are mostly blurry shakes and quite jarring to watch, with a bad fov. The stabilization on modern gopros is magical. The bitrate and quality is orders of magnitude better. You can now pull good quality stills from the video if you want. Hero4 can't handle anything but perfect blue sky in the middle of the day. Etc etc