In film emulsions, the molecules that are light sensitive don't really care from which angle the light strikes them--head on, at an angle, or bouncing back from the film base (halation) all affect the molecules to the same degree. Digital sensors, on the other hand, may not record light that strikes at an angle which is too oblique (e.g. with a wide angle lens which has its inner element close to the film, light from one side of the element would strike the film/sensor on the other side at an acute angle). In practice, users of full-frame digicams (e.g. Canon 1Ds--which would be most likely to show a problem due to the bigger sensor) haven't reported problems with light falloff that's any worse than what they'd get with film. With a reduced size sensor (like that in the Fuji S2), it would be even less of a concern.
Don't worry, be happy, enjoy your current lenses on your S2.
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