It is generally accepted (and test results bear it out) that you get
softer f/2 to f/2.8 results with the 100mm f/2, which may be preferred
for portraiture, esp. of women. At those apertures, contrast is "high"
for both, but resolution is lower in the 100mm.
Both have floating elements, so close focusing distances shouldn't lend
a user to favoring one or the other, unless they need to get towards the
1:2 point (which is the domain of the 90mm). Published test results show
the 90mm as having better performance at far distances, which PROBABLY
matches the characteristics of the 100mm f/2, although I've never read
of anyone testing that.
Gary Reese
Las Vegas, NV
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