In my experience, Noct has a little advantage over 50/1.2 wide open, a hair at 2.0, but they both getting equal to 2.8 and up. New Sigma 50/1.4 is a bit sharper wide open, and contrast/color ratio is higher. Way better is Otus, of every imaginable respect, for the same, or even less, amount of money. But if one wants Noct so badly... LZ
I am sure the Otus is a technical marvel, BUT ... it is *not* a rough-and-tumble lens designed to hike with in the outdoors.
Neither the Sigma nor the Otus has "character"; neither is reversible, where they can take 1:1 macros in nature.
As a hiker and nature photographer, the Nikkor 50mm Ai-S is something I can bring with me, every day, on a hike ...
not worry about rain, falling down, scratching it up, etc.
If I see something cool, up close, I can also flip over the Ai-S, in the reverse, and take great 1:1 macro shots with it as well.
IMO, the Otus (
and the Noct, for that matter) are too expensive and "niche only" to be considered "hiking" or "nature photography" gear.
The Otus is essentially for sterile, studio shooting ... in perfect conditions ... while the Noct is what it is: a nocturne (
not standard use), specialty lens.
For everyday shooting, versatility,
plus a character of its own, I think the Nikkor 50mm Ai-S is
by far the better value.