I recently did an interview with Anson Fogel, the director and DP on a documentary called WildWater. I was going to post this link in the Red forum, but he also shot on the Canon 5D Mk2 and the info he mentions is of interest to any shooter.
For those not familiar with WildWater it is a documentary that has taken the best part of 2 years to shoot, about the heart and soul of kayaking. This is a well crafted piece of filmmaking, nothing like the mindless "Whitewater Porn" you see all over YouTube, and features interviews with living legends such as Doug Ammons.
The interview can be read on my website at
Wildwater. An Interview with filmmaker Anson Fogel | Simon Wyndham - Video equipment reviews, tutorials, and news.