EXCERPT page containing first few paragraphs. 2019-05-20 18:49:20
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In April 2015, an asymmetry/skew problem with the Sony 35mm f/1.4 Distagon was presented in Examples at f/1.4, Bad Sample Lens (Pescadero Creek, A7R).
In August 2015, your author obtained another brand-new Sony/Zeiss 35/1.4, this time to shoot on the new Sony A7R II. It is shocking, but the second sample shows a very similar skew/asymmetry as the first, if anything worse. As if the lens manufacturing is calibrated to produce defective lenses consistently. See the note by James K after the conclusions.
Various readers have written with the same findings: the right side is blurred where it ought to be sharp. Your author’s own findings of two brand-new bad samples and the consistency of reader reports leads to an unpleasant nagging feeling that quality control is problematic at Sony, or that the manufacturing process is consistently producing flawed lenses*. Buying the rather expensive Sony 35/1.4 is fraught with the peril of getting a lousy performer (at right side).
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