In terms of cycle time, non of them come up to the speed of canon Raw.
The best are the G6 and pro1. They both can shoot 4 frames, in raw, at about 2 seconds per cycle, then slow down to 12 seconds per shot, which is the CF write speed.
The G6 has poor autofocus in low light. The pro1 quite a lot better. The sony's blow them away, in terms of autofoucs.
The sony V3 also has raw, but no buffer, so it is always about 12 seconds per raw cycle.
I haven't studied the smaller canons, which would be what you need to look at. The olys and nikons all pale, in terms of raw cycle time, compared to the canons.
Don