So I bit the bullet and picked one up on Amazon. I was hoping to wait for the price to come down some more before buying but the glass railings to the stairs inside my new flat are going in and it would have been very difficult to haul it up to my TV room which is upstairs after that. The only other choice would have been with ropes from the outside and I didn't want to risk that either. It was a bit of a tight fit in the lift to get it to my floor but it made it fine sideways.
I have been playing with it a little bit amidst readying my house for moving in a few days and it does look promising. Since the curtains haven't gone in, there's too much light in the room so I can't really judge it for normal viewing conditions but 4K looks pretty good already. I will post a proper review after setting it up and calibrating it when I have a little more time.
The delivery and installation guys were super nice and very careful with the TV. They checked for any physical damage, turned it on and went through the basic functionality to make sure everything works. I posted a white image on the screen to check for any dead pixels (there were none). It doesn't come with a wall mount so it is still on it's legs until I can source a proper VESA 800X400 mount for it, which the installer has promised to do.
Since I already have a VU 75 incher (which is going into another room) the size didn't overwhelm me but it is still pretty impressive. I won't say it will be a replacement for a projection TV but it is a decent substitute if you don't want to go through the motions of darkening the room every time you want to watch some TV on a very large screen. Here are some pictures to give you an idea of it's size.