No the narrow depth of field is from the Raynox, I think this was probably 5.6 as I remember it was the first picture I took when I got the lens and I wanted to test the lens, but it was early evening and the light in the garden was rapidly fading. (But normally with the Raynox on the front I would use f8 or f11 to get as much dof as possible but still be able to handhold + avoid diffraction).
Unfortunately I have been a bit lax about taking a note of what pictures where taken with what lens (no lens exif data with legacy lenses) so I have others pictures which I am fairly sure were taken with the Yashica f1.9 but I am not 100% certain. But this one I know for sure was as I remember taking it as soon as I got the lens and also uploaded it to my Flickr with the Yashica 1.9 tag just after taking it.
A great compact nifty-fifty prime! If you're a Yashica-Tomioka fan, this one won't disappoint.
(NOTE: This one is aluminum-bodied. Not to be confused with the Plastic-bodied version made by Cosina for Yashica. Designated by: Yashica ML 50mm 1:1.9 C)
Taken with an A7II.