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Thank you all very much for your helpful answers!
I can understand now why this fly caused ID problems.

Re antennae and wings: Unluckily these two pictures were the only ones I was able to get. The fly was very elusive and I was not able to sight it again.

I will stick with Miltogramminae (Sarcophagidae).
I urgently needed some kind of identification for a garden biodiversity project, but for this cause the proper subfamily will suffice.
I had hoped for a Tachinidae since (understandably due to frequency of occurence ) I have documented much more Sarcophagidae but: You can´t always get what you want :-)

Thanks again and greetings!
Una