[Brightcolours]

And it has more aperture blades.

The old one had just three. It had a dreadful bokeh.

And as a previous owner of both lenses, I can easily say the yongnuo is better than the old 50mm f1.8.

The number of aperture blades does not define its bokeh. The bokeh is not the best wide open, sure, and wide open the aperture blades are "out of the picture". And the EF 50mm f1.8 has more than three aperture blades.

 

 I doubt that you had the old 50mm f1.8 (it never came up in the discussion about the yongnuo before.., But if you have owned it anyway, your memory must be failing you on how it performed), and tests and images clearly show the yongnuo to be worse....

 

Just to kill any further discussion on how supposedly the yongnuo would be better, this is what it actually is like.

http://pliki.optyczne.pl/yon50/yon50_fot01.JPG

Crap bokeh:

http://pliki.optyczne.pl/yon50/yon50_fot07.JPG

http://pliki.optyczne.pl/yon50/yon50_fot14.JPG

 

"Terrible" comes to mind.

 

Closed down to f2.2 does not improve matters all that much

http://pliki.optyczne.pl/yon50/yon50_fot13.JPG

 

And the old Canon EF 50mm f1.8 II?

http://pliki.optyczne.pl/yon50/yon50_fot13.JPG

Nicer bokeh:

http://pliki.optyczne.pl/can50II/can50_fot02.JPG

 

And way better at f2.2 compared to the Yongnuo crap:

http://pliki.optyczne.pl/can50II/can50_fot13.JPG