OK here goes with the CV 12 vs the Panny 7-14 @ 12mm.
Jpegs straight from the camera imported to Lightroom no adjustments. Cropped, standard Lightroom export sharpening for screen output.
E-P1 on solid tripod completely level. Aperture priority (you can yell at me for that but it shouldn't matter here), manually focused on far edge of white building (closest to the bridge). Image stabilization turned off.
First up the scene ( user error at getting the wall on bottom left but I don't think it will make too much of a difference) Panny 7-14 @ f5.6
Panny @ f4
Panny @ f5.6
CV @ f5.6
Panny @ f8
CV @ f8
Panny @ f11
CV @ f11
CV looks sharp out at f11 and has less CA through the range. Feels like Panny shows more CA on the E-P1 than on the G1 where Panasonic may have better optimized the CA removal in their processing. Once I have a real processing RAW processing I will work on these. This was pretty much a torture test. If anyone wants the RAW files, I have them all available.