I recall the head of Leica's optical design answering a journalist that lenses weren't developed to photograph test charts, that the quality of a lens shows in "real life", not only in MTF charts...I guess it all depends on whether you are more concerned with taking great images of a three dimensional world, or with taking absolutely perfect images of two-dimensional flat test charts from close distance. I have yet to see a lens with edge to edge sharpness, which requires a lot of correction for field curvature, that still renders smooth, pleasing bokeh the way lenses that leave more than a bit of field curvature uncorrected, such as the Canon EF 50mm f/1.2 L, EF 85mm f/1.2 L, and EF 135mm f/2 L, do.
So what if it's not the best for shooting flat test charts and doing document reproduction work? That's not what I'm going to use it to do.
As for the supposed CA of the 135/2 (which has never affected the kinds of images I've shot with my 135/2): For the most part, if you control the light properly instead of expecting your camera, your lens, and Photoshop to make up for your lack of ability to see and control light, CA becomes a non-issue the vast majority of the time.
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