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The crop sensor on DX makes your lenses have a longer apparent length. A 200mm lens will give a shot that is framed like it came from a 300mm lens. That doesn't mean that you really have a 300mm lens - it is still 200mm but the results will look like 300mm. A u4/3 gives you a 2x conversion so a 200mm lens will look like a 400mm. This is one reason that nature shooters tend to prefer APS-C and u4/3 - longer effective (but not equivalent) reach.
One way to get around this is that a FF sensor likely has higher resolution so you can crop and get roughly the same result.
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