In sigmoid you usually adjust 3 sliders:
- contrast
- skew
- chroma preservation (mostly affects the highlights)
In filmic v7, it’s quite similar:
- white and black relative exposure (often with auto picker)
- contrast
- highlights saturation mix.
Admittedly, I use a filmic preset that sets the contrast in highlights / shadows controls to safe, but then with sigmoid I also use one of two presets (the built-in smooth, of the ‘alternative / sRGB’ values from Introducing "primaries" feature for sigmoid).
These days, I use sigmoid more than I used to, but sometimes filmic gives better (or equally good, just different) results. It’s good to have both available.