nice
Sure does look nice. My 29MB cable connection seems to stream it fine in real time. It DOES totally spike the connection though and doesn't buffer more than a couple seconds ahead.
One can certainly see the difference between 1080p and 4K, although I'm not sure how they got the 1080p version - if they filmed in 4K. If they down rez'd it, that might be where some of the loss in the 1080p quality is.
I'm not convinced this is the future though. Certainly moving from SD to HD was a winner for nearly anyone. Moving from HD to UDH, I'm not so sure.