I's experimenting with my Canon 50mm f/1.8 II to get familiarized with the bokeh pattern at f/1.8.
What I have noticed difference between the bokeh in the viewfinder and the actual taken photo. To me the recoded photo was more blurred.
The subject was at about minimal distance, which is 45cm for this lens. The background was about 40m away, and the highlighted bokeh circles in the background were car roofs.
The Picture was taken handheld.