No, that's the AMOUNT of background blur. Bokeh, or the QUALITY of the blur, will depend on the lens and is a characteristic of the lens.
Bokeh and the "QUALITY" of bokeh is a very widely discussed topic. The Carl Zeiss factory has an article dedicated to this subject and it states that bokeh is dependent not on lens alone but on many other parameters, I quote some of the pertinent points below:
Quote:
All the parameters listed here influence the phenomena outside the focal plane:
Picture format
Focal length
f-number
The camera-to-subject distance
Distance to the background or the foreground
Shapes and patterns of the subject
Aperture iris shape
Aberrations of the lens
Speed of the lens
Foreground/background brightness
Colour
Unquote.
Quote:
It is therefore not surprising that one often hears different and sometimes contradictory judgements about the bokeh of many lenses. Undue generalisations are all too often drawn from single observations.
Many effects are attributed to the lens even though they are mainly caused by the subject in front of the camera. Differences between lenses are often very marginal but are then grossly exaggerated.
This leads to the following rules about bokeh:
Some caution is advised when making judgments about the bokeh depending on the lens correction, because bokeh is extremely variable.
The correction balancing has an especially strong influence on the blurriness of the rendition at small deviations from the focal point. If there is a lot of blurriness, it usually becomes more and more negligible.
The aperture has a strong influence; even closing the aperture a small amount can cause very visible changes to the nature of the blurriness. Slower prime lenses generally have smaller spherical aberration by nature. So it is no wonder that their bokeh is praised for its appeal.
The spherical aberration of a lens also changes depending on the imaging scale. Bokeh characteristics therefore depend on the focusing distance as well.
Unquote.
For those who have time to read the rather long article, the link is below:
[http://www.zeiss.com/C12567A8003B8B6F/EmbedTitelIntern/CLN_35_Bokeh_EN/$File/CLN35_Bokeh_en.pdf
Cheers.
LEW