Interesting observation, Christian! I'll come to focus-consistence after I've shot more. In the testcharts the delta between focussing on a target with the lens coming from infinity vs coming from 45cm seems minimal, but still can cause some color shift from redish to greenish bokeh at f/1.4 as this lens has longitudinal CAs (not too bad in my opinion).
But shooting on a three-dimensional subject like a tree you have to be very careful to understand where the AF-system thinks the least phase-shift is
@Alex: I'll definitely keep this lens!
@pgtips: This early morning I was runnning around in a cold and foggy dawn with EVs around 1/30 sec, f/1.4, ISO 640. I did not observe any hunting from the lens. With the close-up IQ I cannot prove it as my testchart doesn't have enough resolution for testing around or beyond 1:10.
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