To markogts: Thanks
a lot for comment!
I used to use CPL but don't do it now. Too dark for my 18-55 in most light conditions. Possibly will go with a simple UV.
In this case I don't think darker sky would make a difference, but I think this may be a good idea to post a workshop on this if you want. Same for buildings - if there are examples of idea would be glad to look ;)