German filmmaker Sebastian Wiegärtner did a nice lowlight performance comparison between the Canon 7D, Sony F3 Basic & S-Log and Canon EOS C300 with C-Log.
From the article:
I’ve just got the Canon C300 for one week and I want to share my thoughts with you. Lots of people asked me if I can do a comparison between Canon C300 C-Log Picture Profile and Sony F3 S-Log.
I can’t recommend any of these cameras for you, it’s your decision! It depends what you personally need.
From the vimeo description:
Canon 7D, Sony F3, Canon C300 (pre-production)
Canon 7D: Technicolor Cinestyle
Sony F3: AbelCine Range Profile, S-Log
Canon C300: C-Log
Here’s his direct comparison between the F3 with S-LOG and C300 with C-LOG: