I briefly tested P3P video modes 4096×2160, 3840×2160 and 1920×1080 (footage at ground, imported to Final Cut Pro 10.2.3 and output to 1920x1080 H.264 10Mb/s. I evaluated images exported from video in Photoshop). The only difference between 4096×2160 and 3840×2160 is that the latter is 256 pixels narrower and fits the 16:9 frame with no top & bottom letterboxing. I output 1920x1080 so I might switch using 3840×2160 from now on. 4096×2160 needs 107% zoom in so I can skip that unnecessary step. Setting the horizon straight is another story (usually 1° or so with about 110% zoom in). For some reason compared to 3840×2160, the 1920x1080 slightly zooms in to the video and there seems to be some "lens distortion-like" stuff going on between them. There wasn't much difference between 4096/3840 × 2160 vs 1920×1080. Only at 400% zoom the 4096/3840 × 2160 were different but even then I wasn't quite sure whether I prefer the pixelated but sharper 1920×1080 vs detailed but pixel-smoothed 4096/3840 × 2160. I have a real-world clip shot at 4096×2160 with 4096×2160 vs 1920×1080 Final Cut H.264 output. The 4096×2160 video is somewhat more crisp, but on the other hand, it somewhat stutters even on very recent PC HW and 6MP screen on VLC so I prefer 1920×1080 for presentation. As expected, there was no difference between MOV and MP4.