Thanks everybody for your valuable thoughts! It's hard to get honest feedback, it's much appreciated!
I agree it may not be the "supershot" worth putting hours of work into it, but I'd like to try whats possible here. I see the halos, of course, will check the given method some time. Also it sounds like a good idea to tweak the WB of the sky. (It's already desaturated.)
Basically it seems like the picture really is over-processed. Getting the brightness of the sky down has it's limits, it's hard on the edge, here.
What I really need to check is the sharpness thing. For my standards the picture is okay (not perfect, though, I know, hand held and a rather "simple" camera/lens combo), so I really was kind of surprised about that comment. Maybe it's just some artifact from downscaling? I will have to look closer at that.
This one is processed entirely with capture one alone, no more PS tweaks (but scaling). I just want to learn to get along with one single SW. But I see there're limits.
I'm happy some like the overall picture, and it's general appearance, apart from some flaws in details. Thank you.
Thanks for looking again!
farbschlurf