Canon must have found a cheaper way of making DO elements for these two lenses, as Canon has historically charged a hefty premium for DO lenses. Maybe they are molding the elements instead of cutting them down to shape, analog to the same processes for aspherics. DO elements already induce flare artifacts in their bokeh, molding could introduce another layer of unpredictability, like the onion-shaped rings on molded aspherics' bokeh circles. Also, was not equipping an iris diaphragm an engineering limitation or a budget decision? On the 85mm, the only thing I can say is that its front element is very small, ensuring heavy vignetting and lots of cat's eyes, which was to be expected, as this lens is a companion the similarly small front element 35mm. Looking forward to seeing what type of 20mm lens Canon will concoct to accompany the 35 and 85mm.