Ahead of their full review you can now use the studio test scene comparison at Dpreview. Above you can see the comparison without Pixel Shift and below the images show with Pixel Shift on.
E-M1III at Amazon, Adorama, BHphoto, GetOlympus. Olympus DE. Olympus UK, Olympus FR, Olympus ES, Olympus IT, Olympus NL.