Thank you my friend, thank you so much :)))

I don't think, that I could give you some objective advice, because I love Canon, but if I had not bought the new Canon EOS R, I would definitely have thought of a Sony A7, which should be a very good camera.
I use relative cheap circular polarizer and neutral density filters by Gobe, because I cannot afford square filters at the moment.
I use a tripod for most of my photos, especially for long exposures like these photos.