I just started to think about my companion camera to my GH4. As I'm moving forward to 4K/Ultra HD for my small media company, I need a 4K capable b-cam. Could the LX100 or maybe the FZ1000 be a good second video cam? I'm doing a lot of hybridphotography; mixing a lot between stills and video, and many times just pure video. As of this time I just got the GH4 with 4K capability and my Nikon D610 as second video cam (Full HD only b-cam) as I just traded in a lot for the GH4. I'm not rushing in for a second 4K cam but I'm just wondering if one of these cams I mentioned could serve well as a 4K b-cam to the GH4? Need some advise here as I've just started to explore these options.