Originally posted by tuco When lenses are really close in terms of sharpness, how a lens renders it's out of focus can decide which is better. There are no bokeh examples here.
True, and some of the same lens elements that contribute to bokeh also contribute to diffraction and specular highlight effects, not to mention microcontrast. It would be interesting to see some reality-checks done in those areas, as well.
Bokeh, I must say as an aside, seems to me to be in deep danger of becoming a photographic cliche. It is, obviously, useful for subject isolation and abstract effects, but how much bokeh and of what quality is an interesting question. I struggle to optimise the use of the thin DoF available on my A50/1.2, much of the time, and I haven't yet used it on my film Pentaxes. Andreas Feininger's book on colour, written in the film era but still relevant today, ranged over the variety of lens effects available for subject isolation. Bokeh (even ough the term wasn't used then, except perhaps in its native Japan), was just one.
We may be disappointed or just surprised by the results of such tests, but, being properly scientific about the process, isolating different characteristics, such as Norm has done here, contributes positively to our collective understanding of the outcomes of the photographic picture-making process. More power to you, comrade.