The DPR review of the Yi MFT camera is not pretty: https://www.dpreview.com/reviews/yi-m1/7 The main complaint is that it has very poor autofocus ("unusable" in continuous and video modes). Good autofocus is important, especially for entry-level cameras, so I don't think Olympus and Panasonic are too concerned about Yi stealing market share from their entry-level models.