Not that I have much to add to the discussion, but I will vouch for the 4K e-shift on new JVC projectors. I have never seen such detail from a home front projector as I have from the DLA-X70 projector they have set up at my store. It replaced a DLA-X7 and although it is only being fed 1080p BD content, I've never seen said content look better and did not notice any picture anomalies while watching Jurassic Park, Tron: Legacy, Transformers, etc. on it. I was able to walk literally a foot away to our 115" screen and not notice any visible picture structure. I can only imagine what it would look like if fed with an actual 4K feed.
I hope 4K resolution comes to quasi-affordable consumer displays, and comes sooner rather than later. With the advent of 70" and 80" flat panels, 1080p isn't going to cut it for much longer. BD content looks unimpressive on the Sharp 80LE632...I'm not sure if it's a limitation of 1080p on such a large screen, or the fact that it's just not a videophile-grade set, or a combination thereof. It's hard to know without an 80" 1080p Elite to compare it to.
ht Panasonic 60" ZT60, Monitor Audio: Silver RX6, RX Centre, Radius 90HD; Martinlogan Dynamo 700, Marantz SR5006, PS3, Oppo BDP-103D
2ch Sony KDL-32W650A, Sony BDP-S1000ES, Marantz PM8004, JVC T-X3 tuner, Monitor Audio Silver RX1, REL T3, Apple TV, Peachtree Audio DAC•iT, Sennheiser HD598
lr Panasonic 50" ST60, Sony BDP-S5100, Apple TV
pc Energy CB-5, Audioengine D1, FiiO A1