In the description for the XF lenses for its new X-Pro system, Fujifilm crows:
The [XF lenses] all offer precise control over depth-of-field and deliver excellent out-of-focus bokeh thanks to the design of the molded aperture diaphragm blades. The blades are curved to create a circular image at all aperture settings, while the very edges of each blade are meticulously rounded off rather than simply cut off, which delivers a sharper image. [Emphasis added]
I understand that curved blades — often described as rounded blades — help out-of-focus areas appear more attractive when stopped down, by producing a circular bokeh pattern instead of a polygonal one. But this is bragging about something else: apparently the edges are smooth in the other dimension.
Does this really matter?
Will it really improve sharpness? Does it affect diffraction in some way?
What about subjective qualities — might the bokeh be affected in some way?
Is this construction used on other modern, premium primes with rounded aperture blades, or is it unique?