One issue that I see are colors all the GH4 video I have seen so far except ejunlae have really dead colours I think the cinelike profiles are not really suited to underwater use
I can't speak for cinelike-D, as I have not used this profile. I for one think flat profiles for most u/w shooting are an exercise in futility. Cinelike-V, however, creates great colors from the GH4. For some fish/situations, the Cinelike-V maybe a little to vibrant for some people's taste.