David Stump's RED files are up

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You can make the 4k sharper if you want - change the demosaic to a different one, but I like the smoothness and continuousness of the current one. However, There's significant difference in your test between 2k and 4k it would seem. Also, the resolution trumpets are for HD, not 4k, so don't go detailed enough.
 
Interesting.

Is that image you just posted 100% from the orginal?
At 100%4K the differences between 4K and re-scaled 2K are very small - one pixel only - and so they are hard to see. However if you blow that up for a closer look where the human eye can see a difference, or run it throguh some processing, like keying, then the differences will be clearer

Also, keep in mind when re-scaling that the upscaling algorythem will work best when it's bringing back something that was scaled down with the same algorythem. The difference in true 2K and 4K source may be more noticable.

- Mikko
 
sndrk.. on a little screen the difference between 4k and 2k isnt that noticable... on a 40' screen it definately is.
 
The images I posted are 100% crops from the original, no sharpening or scaling or anything else. I agree there is a difference but I would have expected it more to be since there are 4x more pixels in the 4k one.

As said, it is not something I am worried about. Just think it is interesting and I wonder what it is.

I doubt it would be more visible on a 40' screen unless you're uncomfortably close to it. I mean, like closer to it than the 1/2 the width of the screen.
 
I'm noticing a strange artifact on the left flare. The red (no pun intended) flare has a sharp and dramatic cutoff. This is only in the red channel. Is this a lens characteristic or something strange happening on the chip?

It's most evident on f2-4.
 
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