Since a few days there are statements on the net that the Sony A7III in fullframe 4K mode stretches the video vertically compared to the S35 Crop. Here the corresponding YouTuber video:
To speak of a real Sony Alpha 7III bug, however, we still find the current information situation somewhat thin. Unfortunately we currently do not have a Sony A7III in the editorial office to try it out for ourselves.
In any case, we would also like to understand stretching on other editing software and, if possible, investigate the phenomenon before installing the last A7III firmware update. Recording with external recorders could also be helpful to eliminate codec-specific errors.
Many A7III owners would certainly be interested - so if you can provide clarification here, please post in the comments...