I always thought of it as the result of two characteristics --
Pleasant bokeh and very sharp, distinct focused area.
The first makes the image realistic.
The second makes the subject standout.
While a lens may perform better wrt resolution at certain apertures (commonly
from f8 to f16) its optimum image result may be better at others.
>From personal experience/perceptions ...
The A100/2.8 seems to do this well @ f8.
The A50/1.4 seems to do this well from f5.6-f11.
Sincerely,
C. Brendemuehl
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'Politics is supposed to be the second oldest profession. I have come to
realize that it bears a very close resemblance to the first.' Ronald Reagan
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