With the S5 Panasonic released a very intresting enry level camera. The big problem is their autofocus performance when shooting videos. But put that aside and the camera is a worthy competitor of the Sony A7III. Here is the full report from Explora (article here).
Pitting the S5 and a7 III against each other results in a very close battle. They seem to trade out features, making a decision based more on the specific things you want and less about which is flat-out better than the other. Panasonic offers advanced features like a High-Res Shot mode for 96MP JPEGs and raw images, Live View Composite, and plenty more. However, I believe the a7 III wins on some regular specs such as autofocus performance and continuous shooting. To be honest, pick whichever one you like best.
Videographers and filmmakers of all types will appreciate the advantages of the S5 over the a7 III—which is starting to show its age. The S5 offers 10-bit recording, which is incredibly important for high-quality video. It has a crop mode that enables 60p for 4K video. And, the screen is a free-angle design that is ideal for vlogging. The a7 III is still a great pick if you need photo performance as well, but the huge advantages of the S5 for video mean that if you are video first it is well worth it.