Hi Steven, Todd, Terry, qmpel,
thank you for your overwhelming support! 
The most essential point is the preference setting “auto apply pixel workflow default” After changing this to “Sigmoid” or even “display-referred workflow” (and reset the history), I had very good starting situations for all pictures. → so you solved my problem. Thanks!!!
Also interesting that sometimes it could be reasonable to start with the .jpg, when the picture has been taken in automatic mode. (which should be rare… :-))
Thank you for your xmp’s and dtstyle’s. I will check them out and learn…
Have a nice day!!!
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