npcoombs wrote:aren't they baiscally the same resolution?
well, pixel wise they are pretty similar:
1920x1080 for HD vs 2048x1556 for 2K, so if you have a 1:1.85 aspect ratio then the pixel count would be only about 13% less..
however, 2K files are usually 10bit log RGB files while HD formats are usually 10bit linear 4:2:2, or more often 8bit 4:2:2 compressed 1440x1080 (ie HDCAM etc). which makes a big difference for colors etc..
anyway, a good 2K scan from 35mm (or super16) with a direct print from the intermediate will usually look better than a print made from a second generation internegative.. so 4K wont make much of a difference since in a release print you have only 1.5K left at best anyway.
++ christoph ++
edit: ok, matt can put this in much shorter words than me ;)
most 2K scans are either 10bit log or 16bit linear afaik though. (which means you could label this 8:8:8, like some high end color correction machine put it)
edit no2: ok, we seem to agree on the log thing ;)