I just tried 3x3 modes, 14bit lossless, card spanning off, sd card overclocking off (I tried both on, the same results for the 1080p 60 fps):
Canon Q menu ALL-I 1920x1080p 24p mode, 1920x1280p, 3x3, 24 fps, 55 MB/s, continuous, green
Canon Q menu ALL-I 1920x1080p 30p mode, 1920x1280p, 3x3, 30 fps, 70 MB/s, continuous, green
Canon Q menu ALL-I 1280x720p 60p mode, 1920x672p, 3x3, 60 fps, 75 MB/s, continuous, yellow
Canon Q menu ALL-I 1280x720p 60p mode, 1920x1080p 50 fps preset, 85 MB/s, 5 seconds, red, automatically off
Canon Q menu ALL-I 1280x720p 60p mode, 1920x1080p 60 fps preset, red, several seconds, automatically off
I assume that for 1920x672p, I need to destretch to get 1920x800p.
1920x1080p 60 fps at ar 2.4 supposes to work, it is 120 MB/s.
The reason that I am interested in 1080p vista vision mode, is that the lcd is realtime color and can output through hdmi to evf, and can go to 60 fps. At 24 fps or 30 fps, I can turn off the card spanning and sd card overclocking, so that there is no potential risk of overheating. The system is very robust in these modes. These modes are good for doc, news, events, corporate interview, etc.