http://cameralabs.com/reviews/Olympus_OMD_EM1/ "As you can clearly see, the OMD EM1 suffers to exactly the same extent as the EM5 before it, suffering from quite dramatic purple blobs on the image. To be fair in this particular example they're quite well hidden when viewed at lower magnifications, but I have seen other situations where the purple artefact has been visible even with the image viewed on the camera's screen without zooming-in. It is a real issue if you'd like to shoot bright lights with this lens on an Olympus body." "Interestingly while many owners of Olympus bodies and this lens have reported the issue, most people have assumed Panasonic bodies avoid it altogether. As you can see from the GX7 crop though, this is not the case - the same flare blobs are present on the image when you know where to look, but crucially they're much less noticeable. As far as I understand this isn't down to digital correction, but more likely a difference in filtering on the sensor - as both Olympus and Panasonic use different sensors." "But one thing's for certain: the OMD EM5 remains a superb camera, especially if you find the compact size appealing. It's testament to how much Olympus got right that even 18 months later with a better-featured model announced, it's still a lovely camera to own and use.