That is really odd. It would make some sense that the 4K would crop the sensor by about 1.2x compared to full frame photos that is how the GH4 also creates it's image. Every other camera on the market, however, uses pixel binning or line skipping to create a 1080p image from the full sensor. Some cameras offer a crop or use a crop for high frame rate footage. The X5, however, appears to be expanding the high frame rate footage, which is the opposite. How do all of these video crops compare to the full photo size? Also, are the UHD/4K and 1080p crops similar in size?