Here are two quick tutorials by editor Dylan Reeve that will show you the simplicity of importing Canon C300 and Canon 5D MKIII footage into Media Composer 6.0. Watch below.
Canon C300 in Avid Media Composer 6.0 from Dylan Reeve on Vimeo.
A very basic run through of Canon C300 AMA linking into Avid Media Composer 6.0.1
Canon 5D Mk3 in Avid Media Composer 6.0 from Dylan Reeve on Vimeo.
A very basic run through of Canon 5D Mk3 AMA linking into Avid Media Composer 6.0.1