I just posted a review of the new version of Kuuvik Capture for the Mac for use with Canon cameras. I bought it this morning and ran it through its paces. I found it simpler to use than any other capture program for my Canon that offers live view and full camera control. Kuuvik says it was designed for the Canon 5Ds, said it reveals the image in about 2 seconds after exposure. I tested it and it does. It beats the slacks off LR5.
If you think you might be interested in greater detail, I invite you to view the posting at
www.foto-gizmo.blogspot.comAs always, I only review gear I buy for my work with my own money. This blog has no sponsorship and I get nothing sent to me gratis to try out.