It’s official – the Carl Zeiss Distagon T* Otus 1,4/55 ZF.2 lens ($3990) is currently the best lens available for Nikon F mount according to DxOMark:
“With outstanding optical quality, the Carl Zeiss Otus 1,4/55 certainly represents a high water mark for a retrofocus fast standard for DSLRs. However, it might not be the high price that deters people, in practical terms the large size and lack of autofocus may be the more limiting aspects, but there’s no denying optical quality like this demands attention.”
Here are few other comparisons with similar F-mount lenses:
DxoMark released their test results for the Sigma 18-35mm f/1.8 DC HSM A ($799) lenses: