It should be pretty obvious with video, even more than with audio, that different things matter to different people.
Many folks in the industry agree that, to most people, HDR makes a more obvious difference than going from 1080p to 4k.
If you follow the history you will find that 4k appeared before HDR...
It also seems that HDR was released very soon after 4k...
(Arguably, "normally" HDR would have been released a few years after 4k, but....
"HDR was released sooner than planned because 4k alone didn't impress people enough".)
There are also many folks, especially sports fans, who find higher frame rates to make a big difference.
(But, of course, if you watch a lot of movies filmed on actual film, which are done at 24 frames per second, it won't matter at all.)
The reality is that each particular technology brings different benefits...
A higher frame rate gives you smoother motion.
This can be significant with fast moving sports events or games.
But it usually doesn't matter much with cinematic movies - especially older ones.
HDR offers the ABILITY to display a wider range of contrast and color.
This means that really bright and really dark scenes can appear more realistic (or easier to make out).
It also means that certain very saturated colors display better.
It also potentially reduces "banding" in both color and B&W scenes with gradual gradations of brightness or color.
HOWEVER, the down-side is that many movies filmed in HDR, or reprocessed into HDR, can appear garish and overly bright or "cartoony".
(Have you noticed that people rarely discuss how accurate those "brilliant HDR colors" actually are?)
(Many standard color calibration discs don't even include attempting to calibrate the various HDR color spaces.)
And you can also argue whether having a scene look so realistic that you need sunglasses to watch the desert scenes is a good thing or not.
Likewise, 4k offers the potential so see an impressive amount of detail, but only if your eyes are up to it, and only if that detail is really there.
I often joke that "with 1080p you can actually see the newscaster's nose hairs; with 4k you can see the color of his nose hairs"...
And now I add "and with 8k you'll be able to see if his nose hairs are dyed or their natural color"...
On a well filmed scene 4k adds a significant amount of extra detail over 1080p...
But 4k also makes it easier to see bad makeup, and bad edits, and where the matt-painted background really doesn't match quite right...
(And a well lit and filmed 1080p scene will look better than a not-so-well-filmed 4k scene anyway.)
If you want to see where 4k looks obviously better than HD....
Look for specular highlights (those little blinding pinpoints of light you get when someone throws a handful of glitter into a spotlight)...
Or look for the detail in a scene where someone in a hounds-tooth suit walks behind a chain link fence outdoors at high noon...
Or look at any scene that features bright sunlight glaring off waves on water...
Or any scene with shiny or sparkly bits of glass or metal...
You'll see that metal and water often look much more "real" in 4k...
But, in a closeup of someone's face, not so much (or the extra detail may actually seem more annoying that useful).
And, in a landscape scene with lots of foliage, 4k may just make it easier to see how the camera fell short of seeing every leaf and twig...
The bottom line is that you need to be aware of the particular things that matter the most TO YOU...
And choose your technology accordingly...
(You're probably not buying a display because it looks good to someone else.)