I use 60D. Fast lens is a must. In interiors, even during daylight I have to use my 28mm f 1.8 prime to have high quality videos. F4 zoom will probably be fast enough only for daylight outdoors.
Standard picture profile does not work well. I prefer CineStyle from Technicolor, or Neutral/Faithful sometimes.
Som of my advices:
- ISO as low as possible.
- Do not use highlight tone priority in video. It does virtually extend dynamic range, but amplifies dark tones, and increases noises - harshly visible in shadows even in low ISO.
- Noise reduction - consider it when using higher ISO settings in lower light... You must try and see what looks you will like better. I usually consider some minimum noise reduction at ISO 800-1600.
- Consider a rig - handheld pointing is not terribly stable. Tripod is nice for photos in general, but only for some videos. Shoulder rig/steadicam can make difference. See some older Hollywood movies when actors had to approach static camera and say their parts (cameras back then were large and bloody heavy) and compare to modern day Nat Geo documentaries with calmly dynamic camera