I completely disagree with Michael's assessment. Those films each have different personalities and
significantly different curve, recip, and even spectral sensitivity characteristics. Tomorrow I'll lug
my 8x10 up a hill out in the redwoods. For the first two hours I'll be in soft fog, where the several
films might indeed respond similarly, except for speed. Then the mist will either start breaking or I'll
be above it, and all hell will break loose if you don't understand the distinctions. All of a sudden a
steep toe film will render a completely different shadow response than a medium or long toe one,
and in direct sun, the redwood forest itself can easily exceed twelve stops of range. I want a film
which will differentiate between zone 0 and 1, not between 2 and 3, and still retain detail way way
up, even in pyro. Don't tell me simply to minus develop either - that just produces mush in the
midtones! You need the right tools for the job. Plus-X would be worthless in that situation, but
perhaps very elegant indeed in the early mistly hours.