@Nimi wrote that the higher quality 50&85 f/1.2 (not the traditional f/1.8) are also offered by other manufacturers vs. the 135 which is only made my Nikon.I don't think they went with a f1.8 for the 135 Plena just to keep prices in check. It would have been a ridiculously large lens to go with a larger aperture like f1.4 or worse f1.2. They also may not have been able to make the bokeh balls round at the edges unless it was an even larger lens again.
1) It may have been too difficult to make the 50 and 85 f1.2's with round edge bokeh balls without other compromises, like size, weight, CA and of course cost. It also may be more difficult to produce a wider focal length lens with round bokeh balls at the edges compared to the 135. It also may have impacted other aspects of the lens's performance like bokeh, CA, distortion etc.
2) What do you mean the Sony and Canon are higher 50/85 quality lenses? That is pure speculation. To some they might be, to others clearly not. Don't confuse (central) sharpness as the only metric for being higher quality, that is just one aspect of a lens and not an aspect that everyone requires wide open. CA, vignetting focus breathing, distortion, onion ring bokeh, overall bokeh, bokeh transition, edge to edge sharpness wide open and stopped down are some of the aspects that affect a lens's desirability. Not to mention less requirement on post process manipulation via software to fix many of these "issues".
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