Sigma Imaging UK has just made an announcement about their 30mm f/1.4 DC DN lens. Apparently they have found a problem with the lens in the MFT mount. They have discovered that it doesn’t sufficiently adjust distortion while shooting JPEG.
Right now Sigma is looking into fixing the problem to update the lens firmware.
When the new firmware update is ready and released, Sigma will make an announcement to let everyone know that the problem is solved.
If you are having problems or want to know more, you can learn more about the issue by clicking here.