Hands down. the Canon 5D Mark III. I can shoot 2.35:1 ratio of 2.5K for about a minute with no problems on my komputerbay 6fgb CF card.
I get continuous 2.2k at 2.35:1
and I get FULL 1080p continuous.
We're talking about a full frame camera shooting RAW with 13 stops of dynamic range.