How does the bokeh quality of the Canon EF 50mm f/1.8 STM compare to other 50mm lenses

1. Compared to previous Canon 50mm f/1.8 versions:
The Canon EF 50mm f/1.8 STM has improved bokeh quality over its predecessors. It features a new 7-blade rounded aperture design, compared to the 5-blade aperture of the previous EF 50mm f/1.8 II. This results in smoother, more pleasing out-of-focus areas, especially when stopped down slightly[2].

2. Compared to Canon EF 50mm f/1.4 USM:
The Canon EF 50mm f/1.4 USM has "fairly decent bokeh" according to some reviewers, but it's not as smooth as higher-end options[1]. The f/1.8 STM, while not as wide in aperture, produces bokeh that is considered quite good for its price point.

3. Compared to Canon EF 50mm f/1.2L USM:
The Canon EF 50mm f/1.2L USM, being a professional-grade lens, generally produces superior bokeh quality. It's known for creating a unique, sometimes subtly different result compared to other 50mm lenses[1].

4. Compared to Sigma 50mm F1.4 ART:
The Sigma 50mm F1.4 ART lens is often praised for its excellent bokeh quality, surpassing many other 50mm options in its price range[1]. While the Canon f/1.8 STM produces good bokeh for its price, it likely doesn't match the smoothness and quality of the Sigma ART lens.

5. Overall quality:
For its price point, the Canon EF 50mm f/1.8 STM produces surprisingly good bokeh. It's described as "smoother even wide open" compared to its predecessors, especially when you can get closer to your subject[2].

In summary, while the Canon EF 50mm f/1.8 STM may not match the bokeh quality of more expensive options like the Canon f/1.2L or Sigma ART, it offers a significant improvement over previous budget 50mm lenses. Its bokeh quality is considered very good for its price range, making it an excellent value for photographers looking for pleasing background blur without breaking the bank.