No. None of that matters, although a polarizing filter could add some more pop to the sky and cut through haze.
The sky in the first photo is just the kind of sky you’ll have to learn to deal with. Not sure if it ever gets any better in Germany 
You could probably get some inspiration from James Popsys, for how to deal with that:
The last two are arguably underexposed, especially if you intend to edit the raw, since you lose some dynamic range and color fidelity in the shadows. Doing ETTR in such situations would help. Here’s the raw histogram for reference:
A quick edit in darktable:
Muddy tone in images - P9220229.ORF.xmp (16.5 KB)
By the way: