Wait though, you say pictures are representative and that the JS9000 is on the right, but how I picture HDR tvs is the image on the left. That image shows a higher dynamic range, so that details in over/underexposed parts of the image don't get lost, while preserving luminosity.
If these tv manufacturers' idea of HDR is simply overblowing lights (that also happened during the PS4Pro presentation with that Horizon sunset) then there's something wrong about it. HDR should be about colour depth and dynamic range, allowing you to see more and better, not less and brighter/darker.
EDIT: To clarify, I think you should see the sun brighter on the HDR panel, but you should be able to make out the clouds detail around it as on the regular panel.