Here's a good interview/article that may help clarify the question of downsampling and how to achieve true 4K rez without interpolation -
[url=http://magazine.creativecow.net/article/the-truth-about-2k-4k-the-future-of-pixels]http://magazine.creativecow.net/article/the-truth-about-2k-4k-the-future-of-pixels[/url]
[quote author=Samuel H link=topic=563.msg3707#msg3707 date=1334143236]
it makes a lot of sense, but there are also a few silly notes in this rumor
for example:
[quote]It is 4K out of the box but from a 8K sensor. It downsamples for TRUE 4K unlike the Epic[/quote]
if it records 4K RAW, it doesn't downsample to true 4K
if it records 8K RAW, it downsamples to true 4K, but then it's not a 4K camera, it's an 8K camera!
it doesn't add up
[/quote]