I just installed Immich this weekend to try it out - it is pretty good! Face grouping, semantic search all seem to work well.

I find it better than google photos already in some ways. For example, to add photos to an album google forces you to scroll slowly through all of them so the thumbnails load, before you can multi select them all. Immich just let me select the top picture, go straight to the bottom and select all of them. Makes a difference when adding over a thousand photos!