I used a GH4 for about 2 years and really loved the quality. however, hauling around a DSLR system with tripod, head and slider was just too much for travel purposes. so, when I took a trip to phoenix to shoot a short doc about Taliesin West, I picked up a gopro hero 4 and a handheld 3-axis gimbal (zhiyun Z1 Pround). while the gopro has no zoom capability, using this setup completely changed my approach to short doc videos, from the static tripod approach to POV with a moving camera. the gimbal still allows nice smooth pans and tilts, and also allows smooth moving footage. shooting in 4K allows good cropping and zooming in post to bring in details. yes, I miss having some zoom capability but overall, the portability of the gopro and handheld gimbal (easily fits in a small messenger type bag and weighs almost nothing) for travel purposes has completely replaced my DSLR/tripod system. you can see some of my vids on youtube if you are interested in what kind of results this little system can give - here is one I did about Depoe Bay, Oregon -