I bought the EP1, one year after it was released, with the pan.20mm
I was never happy with the image quality, mostly for high noise and banding issues.
I bought EPM1 about a year ago, for 200 euros... Couldn't ask for more! Very good image quality, lighting fast, better focusing, better video, etc...
I am now getting the 45mm, and maybe the 12-50 for video 😛 😛 😛