If the Samsung player also had the issue then it is a TV issue not the device.
HDR movies look incredible on my LG OLED. However my Samsung in my bedroom which claims to be HDR as well, really only accepts the HDR signal but doesn't actually decode it. So it looks washed out from all sources including Netflix or USB plugged directly into the TV, or from the Q10. I would try maybe looking on a message board for that TV specifically and see if others have issues with HDR signals.