But the C-Line is a total different quality. I have the 5D III and like it a lot and use it on my Tiffen Merlin 2 from time to time. But I got my 1D C this week and I can only say the quality of the movies is something I haven´t got before. I filmed parrots with 600mm II lens and 2x III in 4K and Super 35.
That gives me 1200mm *1,3 crop = 1560mm and I can crop the picture down to 1080P and get about 3120mm focal lenght or with the Super35 mode 1800mm because of 1,5 crop . It´s just perfect. Doesn´t really fit on my Merlin anymore but I don´t regred spending the extra Money. And I have to say the clean output is not really needed, the quality will only get better with RAW. But it´s nice to be able to connect a Ninja and get the Zebra and Focus peaking. and a backup of your recorded image in a good quality.