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Sharpest, no doubt. Bokeh......a bit busy for my tastes. The Zeiss has far more uncorrected color issues; why, only Zeiss knows. Maybe they're saving the best for the $5k, 1,2/35 prime to follow the the 55/1.4. But the "atmospherics" of the Zeiss 1,4/35 has an indescribably ethereal quality these other sharper lenses (Nikkor, Sigma, etc.) just don't have. The velvety smooth background aside, skin tones are rendered with a generous sumptuousness instead of the brutal honesty of the these AF alternatives.
Matter of taste, really.
Interesting you post this in "Sigma wow, wow" thread.
From what I've seen in this thread and owning Zeiss 35/2, I must agree with your statements regarding the comparison.
I am feeling the urge to test out the Sigma as I'd have use for f/1.4 and sometimes the AF.
The sigma is about 1/2 price of the Zeiss 35/1.4, but yes, sharpness is not everything.