So Red has announced it’s Scarlet tonight, to take the shine away from Canon and it’s EOS C300, and it is shipping this year with a Canon Mount with Autofocus (unlike the canon mount on the C3800). And it is $9750 with the Canon AI mount and side SSD, $11250 with TI PL mount or TI Canon Mount, and $14015 as a package with the canon mount (as well as aside handle touch lcd, redvolts, redmag 64GB red station and AC adapter).
It shoots true 4K, though not with ramping (and if you try hdrx mode it only shoots at 12FPS in 4K). It shoots at 50MBps, which is much higher than the Canons 50Mbps.
Still harder to shoot with as RED is a process, but is certainly the superior camera, but sounds like the EOS is more going against Sony.