Yeah, I am fairly familiar with it. That said my point was only that you *can* compress a video down to a much smaller size than blu ray if you need to given the same source. It will take *much* longer to encode but it can be done within the limits of reason.
I was making a point to other posters that UHD is such a large format that the amount of MPEG-4 AVC compression required to make it a manageable bitstream for transmission (i.e. video on demand that doesn't take six days to buffer) would invariably result in a sizable sacrifice of quality, so then where's the benefit over 1080p when we already know that 1080p on iTunes H264 has a noticeable loss of detail from BluRay.... now consider the even larger magnitude of loss of detail to compress UHD to a manageable stream (i.e. considerably smaller than uncompressed 1080 is now).
The marginal benefit of that highly compressed UHD bitstream over 1080p for an exhibition on a screen smaller than fifty feet is really moot, then.