The lens tests at
http://members.aol.com/olympusom/lenstests/default.htm
suggest that the difference between the 28mm f2.0 and 28mm
f2.8 are as follows: the f2.0 is sharper but has noticeable barrel
distortion, while the f2.8 is the opposite (but is much cheaper).
The lens tests at
http://www.photodo.com/prod/lens/35lensesmtf.shtml#Olympus
do not include both lenses, but the grade for the f2.0 is only a
2.6/5.0, only average. Considering that I use my wide angles
mainly to photograph buildings, I think the f2.8 is the better lens
considering the lessened barrel distortion. Any comments?
Pete
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