I do believe that this is a sharpening (a.k.a Edge Detail) issue not a resolution issue. If you want to see the effect of the former, take a (SVGA or lower resolution) medium such as security cameras or ichat and observe how faces look. Ever seen deeper age lines? Probably not.
For another illustration of sharpness v's resolution see here -
What this illustrates in the sweater example is you can shoot in high resolution without artificially induced artifacts. The "kindest" option is high resolution, low acutance (sharpness) which is the natural default for RED footage. You can increase the sharpness in post if desired of course.