Pros + Stunningly clear, crisp picture
+ Superb sound
+ Beautiful construction
+ Good price for 4K video
Cons - 4K players are rare and expensive
Summary To me, the big promise of 4K TV will be large screen sizes that don't have the fuzziness of a 1080p signal gone too far. For instance, I have a top quality 1080p projector with all sorts of fancy video processing capability, but even with the best 1080p Bluray sources, the image gets unacceptably soft when projected on my 120" screen. In contrast, a 65" plasma screen looks great in 1080p, but to me, this has been about the limit. 1080p to 4K, having four times the resolution, should look as good as 1080p on a screen twice as large, so I have high hopes that I will indeed be able to fill my 120" screen with a stunningly sharp picture in the not too distant future.
As for the Sony XBR, I suppose I have mixed emotions. First, the picture is certainly quite good, even at 84" and with 1080p content. Side by side to my favorite 65" plasma, I'd say the Sony manages to give about as sharp and contrasty a picture with the same source material, even though the screen is substantially bigger - this is quite a feat. The image has Sony's usual crispness and brightness, and if this is the look you like, you won't be disappointed.
This TV has all the state of the art standards, beyond 4K: HDMI 2.0, latest 3D technology, Internet connectivity, etc etc etc. If you're a tech-junkie, it's all in here.
Still, as everyone points out, there's very, very little content available in 4K, and if you think you can send a conventional DVD image to a screen this large, you may want to audition it in person before spending your money.
Also, keep in mind that you really do need a large TV to see the difference between 1080p and 4K...on two TVs of equal quality, size, viewing distance, etc, the human eye can't distinguish between 1080p and 4K resolution until the screen is big enough to make it obvious. Personally, if I were looking for less than 60", I don't think I'd opt for 4K anytime soon. On the other hand, 4K opens up a whole new dimension, such as the 84" Sony, or giant projection screens - if I'm going large, it's definitely going to be 4K.
One other point about 4K content is that it may be more of a challenge than most people think before widespread adoption takes hold. Although content producers talk about resolution (4K or 1080p), the other issue you have is bitrate, or the degree of compression applied to the video signal. You can find camcorders, for example, that do 1080p at 10mbps, and professional grade equipment that do over 60mpbs. Both are technically 1080p, but the lower bitrate is never going to look as good on a big monitor. A video remastered at 4K but the same bitrate as 1080p likely won't look any different.
Problem is, high bitrates create lots of cost. If 4K is four times the resolution, a movie that barely fits on a Bluray disc will need four bluray discs (or a new technology altogether). The cables and internal circuitry of your Bluray players, AV receivers and so on would need to be four times faster. If you're a cable operator, you can only fit one-fourth the number of channels over your bandwidth. Etc etc etc. No doubt this gets fixed in time, but the easy way out is to simply compress the 4K signal a little more, so you get something that's technically 4K, but isn't really four times the picture quality.
All that aside, Sony has a fine product here, and it's definitely worth an audition if you're looking for a stunning TV that breaks the 65" barrier.
Side note: before buying, check low price for this TV at: Uhdtvs.blogspot.com/p/sony-xbr-84x900.html
Hope this review is helpful.
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