It seems the movement from 1080p to 4K in projectors is much slower than the movement from 480p->720p->1080p was. While the thread about the Optomas for about $2,500 is encouraging, I'm wondering why it is taking so long to get true 4K in a projector. There are 4K flat-panel TVs out the wazoo now (I've even seen 42" 4K LCDs , but true 4K projectors still appear to start at about $8,000 (beyond the means of most enthusiasts). When 4K was first introduced, a lot of people argued that it was of no benefit for the typical 42-55" display with an across-the-room viewing distance. 4K would make a palpable difference for a 120" projected image, though, and projectors are far more practical than trying to manufacture, ship, and install an 80"+ flat-panel TV.