Watching the photos made using Sony a7 cameras with fast lenses, I've noticed one interesting thing about the bokeh. It seems to be that its shape is more geometric, more "banded" in comparison to smooth bokeh of full-frame DSLR cameras.
Is it real, and if yes, what is the reason of it?
UPDATE: I have found some pictures from another cameras using the same lenses I've metioned above, and their bokeh is very different from the first three photographs in this question. Look at this:
As you can see, there is no "banded" bokeh anymore. Opposite, it is smoother and more swirly in the last three photos, made using full frame SLRs.