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Would you mind explaining or offering resources on understanding why it is different? I have a M43 camera as well, and I have always just halved the focal length and aperature I want a lens to be on my system to be a roughly equivalent match to the full frame performance I am trying to emulate.

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I'll try :) Generally speaking focal length is a characteristics of a lens which does not change, if you use smaller sensor you're just "cropping" what given focal length would render. For example if you'd have, let's say 100mpix camera and 24mm lens it would give you different perspective than 85mm evn if you would crop 24mm image to have same angle of view as 85mm.

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