As long as folks are kicking it about, and for what its worth, I think a higher quality H264 would be best way to improve IQ.
The two features being most coveted are variable bit rate (better detail & push colour grade harder), and dual iso video (for HDR).
H264 lets one use higher ISO without Hot Pixel hassles, and the workflow is faster than raw. ALL-I compression shot flat, when handled correctly is excellent.
I sympathize with those frustrated by the 70D raw resolution limits, however the 70D AF does touchscreen focus pulls & faster than focus puller action tracking.
So its AF chops with H264 and ALL-I compression make the 70D useful and even crucial tool.
If one wants to shoot 1920 @ 2.35 14 bit raw, 5DMkII is still best $$$ option (around $1k).
If one can work with less than 1920 @ 2.35 raw via up res.(see my recent post page 58) , thats where the 70D can work. 720p raw or 1500 @ 2.35 raw, the 70D is continuous.
If one wants to shoot 2k and beyond raw, consider the BMD ursa mini 4k, super 35mm sensor, global shutter, 12 stops DR (same as 70D), 12 bit raw (negligible difference from 14bit raw), Da Vinci resolve enabling 444 442 flavours, up to 160 fps slo-mo, and with EF mount lens ($3k + battery option).