It can be added that a sample of this lens was measured here:
http://www.hevanet.com/cperez/testing.html
f/11 67 60 42
f/16 60 60
24
f/22 54 54 38
This is optical performance measured in the center, the mid an in the corner.
The pointed measure at f/16 in the corner, 24, probably comes from a camera alignment or film flatness miss, it's not consistent with 42 and 38.
This was a DIY test, not an absolute Lab test, but it can be very useful to see some trends, see disclaimer at the bottom of the linked page, but if those 67 Lp/mm were seen by Mr Pérez, at least that was there.
Also there is the sample to sample variation... but this test points that, as Bob says, this is a very competent glass, no doubt.
I've tested the old GD 90 a friend has, single coated, also very good but not MC in that case...
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