just a few niggling questions... I've read that the pany 20mm 1.7 has lots of barrel disortion and has to be corrected in camera with software, so does that make it a good lens if has to be corrected? What about edge sharpness when the software has to stretch the corners and inter polate the pixels, it must have some effect? Is a RAW file a RAW file when it has been doctored? If the GF1 has this built in software to correct the barrel distortion, when this lens is used on the Oly , does this have the software to correct it?