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Posts by TenoBell

 There isn't much publicity available published information on hollywood studio delivery criteria.  I will amend this a bit and say their are some movie houses showing 4K, generally they are in larger markets like New York, Los Angeles, London. But this is fairly rare because the studio charges the movie theater a premium and the theater is charging the audience a premium for it.  As well very few movies are produced in 4K, pretty much only the summer and Christmas holiday...
I see what you are saying though its doesn't quite work that way either. Really you'd want double or triple the number of pixels needed to create a 4K image. Depending on the sensor design not all of  the photo-sites are used for picture. A lot of information is lost in the optical low bypass filter, debayering, and A/D process, so you need to start out with much more than you end up with. 
While movie theatre's have 4K projectors, movie studios don't deliver 4K movies - they deliver 2K movies. Most people don't know the difference. Producing a 4K deliverable to movie theaters is a lot more expensive, and would not likely equate to more people buying tickets for the movie.
This is exactly my point the vast majority of content is 1080P not 4K.
 There are always trade offs in one way or another. To increase the pixel count by 4 times either requires making a larger sensor or making the pixels smaller. Smaller pixels compromise low light capability and make A/D processing somewhat more complex.  Then there is the question is going through all of that worth the result in the end? 
Broadcast HD was grafted onto the older NTSC broadcast standard. It was a way to simulcast both SD and HD in away that would not require expensive equipment upgrades. The result though is today the quality of broadcast HD is mediocre at best.  A switch to UHD would require expensive equipment and infrastructure upgrades that would radically improve quality, so it could be argued a properly implementation of UHD (in contrast to what we have today) would be a noticeable...
4K does offer zooming, panning, cropping. That does not automatically translate into a better picture.
 The 5K iMac is largely targeted at professional video editors, photo editors, and graphic designers. Doesn't seem like that would be difficult to understand. 
The far majority of content you are watching is scaled 1080P, if you are watching broadcast television you are watching scaled 720P. 
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