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I saw these flies (2 male & 2 female) in a woodforest near Amsterdam.
I know that they are difficult to identify but I'll try.

Breast and backbody grey and black (little blue).
Backbody blocked but less blocked than Sarcophaga carnaria.
Stripes on back are also less blocked than Sarcophaga c., more grey and less white.
Eyes are purple-red (could be influenced by some artificial light) and not blood-red
Wingdrawing shows not many crossing-lines in the end(top) of the wing.

(I'm sorry using non-scientific-language)
Robert Heemskerk