i notice the new canon L lense have "circular blades" in the lens. to the eos users here, do they have more pleasing bokeh? in general, is there a consensus here that more blades equals better bokeh? i noticed the bokeh lenses have more aperture blades, but then the leica asph and the c/v 50f1.5 are not known to have pleasing bokeh though very sharp. is there an objective way to achieve discs as oppose to donuts?? is that the reason for the circular blades in the new canons? or is it gimmick and myth?