Cinima5D will likely be the site to really settle the Panasonic GH5S vs Sony a7SII debate once and for all, but will it be before we see a Sony a7SIII? Sony rushed the Sony a7RIII to market after the Nikon D850 was well received, but the Panasonic GH5S is getting a mixed reception thanks to the removal of IBIS. While I respect this decision and have always valued Fujifilm excluding it from their cameras in order to keep the X-mount as small as possible many demand IBIS for adapted glass.
When it comes to native glass Panasonic already has a lot of glass with OIS, which is better for image quality and a feature that many of their competitors hasn’t developed as much. Panasonic has always had great OIS and some of their OIS glass is in its second generation already offering great performance, which will likely get better via firmware updates. For those that need more the Panasonic GH5S balances just fine on relatively affordable gimbals due to its smaller size/weight. If you are a serious videographer/cinematographer than the Panasonic GH5S should be perfectly suited for your needs.
