I do technically have HDR display (Dell s3220dgf) but it looks worse in hdr than in sdr mode, if you send hdr signal to it all it does is bump the back light to max and the whole image looses contrast and looks washed out .
As soon as good 32'' HDR display that's not Asus proart pa32ucx becomes available I'll get one, it doesn't look like it's gonna happen soon though.