the price is ridiculous, but its still good to see sony trying to stay relevant in tech advancement. like it or not, their high end TVs are some of the best. at this price I doubt they will inspire any other developers to bring out 4k tvs soon though.
This is good, particularly at 84" in size .
Of course, this is also the exact equivalent of 4 x 1080p TV's stacked together. We do need true 4k resolution content to made available at the same time since you really don't want the original 1x1080p content 'upscaled' into the remaining 3x1080p 'TV's' no matte how good the upscaling (mapping 1x1080p into 3 additional 1080p, I'm guessing, would be noticeable at reasonably close distances).
The average viewing distance for living room HDTVs in America is around 7 to 10 feet, depending on the screen size. So to appear "perfectly" sharp with 20/20 Vision like the iPhone 4 Retina Display, HDTVs only need a proportionally much lower PPI in order to achieve "Retina Display" status and have the HDTV appear "perfectly" sharp and at the visual acuity limit of your eyes.
Existing 40 inch 1920x1080 HDTV is a "Retina Display" when viewed from 5.2 feet or more
Existing 50 inch 1920x1080 HDTV is a "Retina Display" when viewed from 6.5 feet or more
Existing 60 inch 1920x1080 HDTV is a "Retina Display" when viewed from 7.8 feet or more
Since the typical HDTV viewing distances are larger than the minimum distances listed above, the HDTVs appear "perfectly" sharp and at the visual acuity limit of your eyes.