Thanks Karl Heinz - it came as a surprise to me too!
Regarding processing in-camera, I think there is possibly a little bit of sharpness falloff correction going on even to the RAW file. Quite subtle and it might not even be there but in one or two files I felt there might be a touch more noise towards the edges. I will be looking into this more when I review the EM-1 itself...
My curiosity was piqued. I set up the E-1 on a tripod, leveled it, and targeted the vertical blinds in my office at 5' 5" distance. I set the camera to +1 exposure on A mode, ISO 100, f/3.5, and AWB. In sequence, I fitted the 11-22 and made exposures at 22, 18, 14, and 11mm, then the 35 Macro, then the 25mm f/2.8. With each exposure, I forced the camera to refocus. I repeated the same settings and capture sequence with the E-M1.
Some interesting results looking at the .ORF files in Lightroom 5.2:
A - Regards the rectilinear correction, at least using Lightroom to look at the files, they are virtually identical between the two cameras. Whether there is a difference in the JPEGs I didn't look as I forgot to set the E-M1 to capture JPEG+raw.. doh!
B - The AWB from the two cameras returns very different results! The E-M1 did not filter our the somewhat greenish cast from the windows, the E-1 corrected that out to a neutral color. Very interesting.
C - The sharpness and detailing across the field with both the 11-22 and the 35 Macro seems almost identical, up to the limit of the 5Mpixel E-1's resolution limits. The 25mm, however, appears to image with more sharpness at corners and edges with the E-M1 compared to its performance on the E-1.
D - Some later CA was apparent with all of the three lenses and exposures. Turning on Lightroom's "remove chromatic aberration" correction manually removed it entirely. No fringing was apparent.
I opened the files in Olympus Viewer 3 as well. Geometric correction looks the same. The white balance difference is apparent there as well, and to the same degree. So is the*apparent sharpness difference with the 25mm lens. The chromatic aberration seemed less apparent.
I'm not expert in Viewer 3 as yet so I don't know if I enabled the correction filtering properly. Really should read the help for it...
That's all I have time for today, but it is very interesting to see how similar (and how different!) results using the very same lenses on the E-1 and E-M1 can be.
fun fun fun,
G