I imagine Zeiss must gnash their collective teeth quite strongly. They invented the Otus series which was supposed to prove that, for a quite astronomical price, you can produce an optically outstanding lens practically without any flaws.
solid and stylish casing,, brilliant image quality in the frame centre,, sensational image quality on the edge of APS-C,, very good image quality on the edge of full frame,, lack of noticeable problems with spherical aberration,, moderate longitudinal chromatic aberration,, imperceptible lateral...
too high vignetting on full frame.