The Mij is better than thought, here are some updated results. Make of them what you will. I am reading a book which I could recommend in terms of spirit of testing, written by Richard Henry "Controls in black and white photography". Notably, he makes the point that no one can be more accurate than 1 group in rating the resolving power of a lens using a tricolumnar test pattern. In this spirit, a key lens in my testing is the Tamron 90mm SP 50B, which I have as a reference and can be used as a control as it can be mounted on different camera bodies through the various available adapters. Further, its a notoriously sharp lens in an absolute sense, so it gives an indication of the upper limits available due to other factors in the testing such as the resolving power of the film used. So in this instance, I used the Tamron in identical testing of a MX about half an hour later, with a fleet of Pentax M lenses. I dont include the results as they are not really relevant to an Olympus group. The conclusions I would draw are: a) the MIJ is capable of hitting 60lp/mm at f8 b) at f5.6 its softer than the Tamron SP c) The Tokina made Vivitar S1 lens is pretty respectable compared to the Oly 135 prime. Further testing could include impact of tripod, cable release, filters, hoods, developer, film, exposure.

Setup:
25/05/2013, 15h10, sunny
tmax 400
190 tripod fully extended, Foba ball head, manual shutter (not cable release), no MLU
target 36 inch wide Edmund test patterns, contrast reported to be 100:1
metered using Lunasix F incident reading
XTOL 1:2 10.5mins 20.0deg, 30s + 3 inversions every 30s
Nikon 50/2.8, Microsight 25x
f4 shots were overexposed by a stop, as the meter would have recommended shooting at 1/2000.

name lens, focal length, distance to target, f4, f5.6, f8, f11
Olympus 28mm 2.8, 28, 3000, 27, 67, 67, 53
Olympus 50mm MIJ, 50, 3000, 42, 47, 59, 53
Tamron SP 90 2.5, 88.5, 6000, 60, 60, 53, 60
Olympus 135mm 3.5, 135, 6000, 43, 43, 55, 55
Olympus 135mm 3.5, 135, 6000, 39, 43, 55, 55
Vivitar S1, 70, 6000, 48, 48, 60, 67
Vivitar S1, 210, 6000, 35, 44, 49, 49

NB step in line spacing between patterns is 12%, so that 6 increments results in a doubling of the line frequency