As RAH said in another thread, there is hdr and then there is HDR. An HDR pass, judiciously applied, can bring out some of the colour and dynamic range in classic large format and even some regular format 35mm films. OTOH, there are some releases that can be considered revisionist in terms of the application of HDR. The original Ghostbusters comes to mind. Lionsgate has released some of its 4K titles so that HDR can actually be turned off, thus preserving [to some extent] the original look of the film.
Most, if not all, 4K UHD players currently on the market allow you to disable HDR.