While preparing to sell my NEX-7, I preordered an A7 since people were thinking that the A7 would be better for video. Then SonyAlphaRumors reports a NEX-7 upgrade is due in 2014. Then your test shows that the A7r is better for video. Now I am really stuck! :) (first world problems). In the end, none of them are ideal for my eyes, since I was spoiled by starting out shooting film (mostly super 16), and grading film in expensive suites. My heart still longs for a small camera, prime lenses, and film-quality footage. Until that day arrives (not long now, I expect), I am debating whether to keep using the NEX-7 (and all the lenses I have bought) or jump up to A7 or A7r. Each day, a new bit of info makes it more complex...
I just did a job with the FS-700 — loved the frame rates, hated the codec. True about Sony's codec. We have to convince them to drop it.