These are with a "hacked" J-3 5cm F1.5, made using a 1958 lens with a 1974 front element. I shimmed it for the Nikon RF's.
The J-3 itself came out soft, but the Bokeh came out very smooth.
I've tested it at F1.5, at the end of a roll. And somehow forgot to stop it down for any of the shots... It's a nice portrait lens for the Nikon, smoother than the Nikkors. But not as sharp.