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Little comparison with the Leica 45/2.8 macro:
First, at 1:1 and f/7.1.
100% unsharpened crops. Olympus 60mm on left, PanaLeica 45mm on right:
I couldn't compare corner crops on this shot because when moving the camera for the different FOV, there was a very, very slight difference in the angle of the camera. It's extremely slight, but it's such that in one corner, the Oly 60 is slightly better, while in the opposite corner, the Leica 45 is slightly better. Looking at general sharpness, they are essentially identical at 1:1 at this aperture. Maybe a slight edge to the Oly, but it could be down to very very minute differences in focus at this level of magnification. One note, when slightly OOF, the Leica gets a very slight purple hue to the edge while the Oly remains aberration free.
This is further back, close, but outside the macro range (about .6m on the Oly).
Full shot @ f/5.6:
100% Unsharpened center crops: Again, Oly 60 on left, Leica 45 on right:
100% Unsharpened corner crops: 60 left, 45 right:
Center resolution is a toss up, but in the extreme corner, the Oly is a little bit better. These were done with autofocus, with the focus point on the chip.
I also tested the Oly 75 at this distance and it was very good, but since the 75 was very close to MFD, while the macros are more or less in their wheelhouse here, the macros bested the 75 at this focus distance in the center. The 75 was better than the 45 in the corner, but not quite as good as the 60. I'll test the 60 v the 75 at longer distances, say 1m and even further out later on.