Everyone seems to repeat this anonymous source about -4 adding blur, it's ridiculous. Just about every video I've posted here in the forums shot with the X-T2 and a half dozen or so Fuji lenses was shot at -4 and they are incredibly sharp. And I've never run into moire or aliasing issues, at least nothing that popped out at me. Though I don't own it, the 18-55mm is a spectacular lens by the way.
These images are all soft, they look like they were shot through a filter with vaseline. Something's not kosher here.