Is it worth it to upgrade to non HDR 4K TV for price reasons, or better to hold off?

[shinobipopcorn]

You see all these ads for LG and Samsung 45, 55, even 60" 4K sets under $600, yet the HDR sets are in the thousands. Is it a noticeable quality jump for someone who has a 720p or 1080p TV now to upgrade to the format, or is it just more unnecessary pixels at this point?

I've seen example pictures where HDR brings out more detail (the Mad Max shots where you can see the sky in the HDR set and it practically blinds you), and that seems like a very solid investment, but what if you just can't afford it? Do you go half way, or stick with what you have until the prices go down?