I have 4k TV and 5.1 studio speakers and noone in my house can see the difference from modern streaming besides a little grain on still images. Always buy newer, at least two-layered disks, they are much better.
Of course that’s nothing compared to 4K/DTS/DA/HDR Blu-Ray rip, but it’s not that the movie is not watchable. DVD is the basic experience, 2010s cinema like, where Blu-Ray is just a crispy fresh layer added.