Depends on what focal length you need, which depends on what kind of subjects.
I have used both lenses on micro 4/3. Both are decent but nothing exciting. I wouldn't use either of them wide open for anything critical, especially for anything backlit or with bright highlights.
Try to get at least an SSC model, or better yet the twist-on mount for best coatings and better flare control.
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Portrait, figure and fantasy photography at Silver Mirage Gallery:
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