EM5 100-300 Kid's Soccer...

I'll show a full sized crop with an enlarged area so you can clearly see what is going on. I see halos of this magnitude in images with any amount of reduction ... I am highly sensitized to them as I cannot abide them.

Update: Forgot to mention that the signature of digital sharpening is a heavy white line on the light side of an edge and a heavy dark line on the dark side. These are rather extreme ...

You should check you camera's JPEG settings and consider moving them below default ... applying sharpening in post is much more delicate and can easily avoid halos if the JPEG engine is not sticking them in there in the first place.

By the way ... OM-D images always look a little over processed to me, so you may have to turn the sharpening down a long way to get something that looks more natural.

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http://kimletkeman.blogspot.com