A comparison on a photo on which I had some trouble getting the colours right:
Old edit with filmic (v6, max RGB):
New version, swapping filmic with sigmoid (all else left the same, as I was quite happy with the immediate result):
I like the colours of the sigmoid version more, especially since it got rid of the weird green tint in the clouds, which I was unable to handle in the filmic version. Thanks to tweaked highlight reconstruction settings, the filmic version has a smoother transition to the clipped highlights, though, which I prefer over what sigmoid does there.