Here is a video comparison of new released Sigma fp compared to Panasonic Lumix S1 full frame mirrorless cameras. Both cameras used the Sigma 45mm f/2.8 DG DN Contemporary lens. From the video, we can see that Eye-AF of Panasonic Lumix S1 is much better than Sigma fp.
Here is a high ISO comparison of recently released Panasonic Lumix S1H with Panasonic Lumix GH5. You can watch the full comparison video above. From the video, we can see that Lumix S1H’s high ISO performance is much better than Lumix GH5.
Panasonic has just announced the firmware update version 1.2 for S1 and S1R full frame mirrorless cameras, and this firmware will be available on July 9th, 2019. Youtuber Richard Wong has tested Panasonic S1 with firmware 1.2 compared to Sony a7 III on video autofocus performance. It seems that in some conditions, S1 is even better than Sony a7 III. You can watch the full video above.