I had heard that the Canon 5D Mark III audio was OK and proved it here with the DR-60D by sending audio from the DR-60D to the 5D Mark III.
The trick was using very little gain on the Mark III and using the line output gain on the DR-60D to do the heavy lifting.
4/2014 Update: We also found that you could get a better feed into a BMCC camera this way. Line out from the DR60 to the mono 1/4" inputs of the BMCC. Set the BMCC to MIC instead of line and set the BMCC input level to 15% and the Line out of the DR60 to 3. Faint noise but more than adequate for a scratch track.
TASCAM, and parent company TEAC, to their credit, have always empowered people to be able to do creative audio production at a fair price, especially at the pro-sumer level.
