I looked at the Samsung KS series but since I can't fit a TV bigger than 43" in the space the current TV occupies, my options were:
43" KS7500 - it's curved, so I was very reluctant to get it
49" KS7000 - flat screen, but £879 so a good £300 more expensive, and also would necessitate rearranging various parts of the room which I don't necessarily want to.
The brightness is nice but since I watch a lot of TV shows at night with lights off, I don't think having eye searing brightness would be a huge positive in my situation - I've read in the X800D thread that people had to lower the brightness even on that screen for viewing in a dark room.
I'm not sure if I'd miss the added brightness for watching HDR though, so I'd be interested to hear from X800D owners on how HDR looks.