I hope the mechanical shutter vibration problem is solved. Since the electronic shutter cannot yet, at least completely replace it. The first curtain shutter only partially alleviates the problem. But we are not alone, the mirrorless sony and nikon have similar problems. I have not seen or heard anything about canon, but for sure there are problems there too.
As for the twenty-five millimeter fixes, I was quite harsh in my statements. I myself actively use kit lenses, and I think that you can get good results with them, but there are better lenses that are just a pleasure to deal with.
A few quick photos where you can see light sources at different aperture values, a bit small, but how did it happen. It is noticeable that up to 2.2 the circles are even and homogeneous. Then nuts and onion appear. On the other hand, this is not so bad, already at 5.6 you can get asterisks. in the last photo it is slightly visible if you enlarge the image.
2.2
4.0
5.6
7.1
I will make a more successful comparison a little later, frost has hit, and as an evil, there is a lot of work.