Konica Hexanon AR 57mm f/1.2 vs Olympus OM-System Zuiko Auto-S 55mm f/1.2

What actually differs

• Both open to f/1.2, so neither has a speed advantage.
• The Olympus OM-System Zuiko Auto-S 55mm f/1.2 is cheaper. Typical used value is $500 against $850, a gap of $350 (roughly 1.7x). Ranges: $300 to $900 versus $500 to $1,600.
• The Konica Hexanon AR 57mm f/1.2 is longer at 57mm against 55mm, a 2mm difference that tightens framing slightly and increases background magnification.
• The Konica Hexanon AR 57mm f/1.2 is the older design; production began around 1965 against 1972 for the Olympus OM-System Zuiko Auto-S 55mm f/1.2 (1965-1970s versus 1972-1984).
• They use different mounts, Konica AR and Olympus OM, so each needs its own adapter. Both reach infinity on mirrorless bodies with a plain mechanical adapter.
• Both use 7 elements in 6 groups.

Which one to buy

On the catalog data the Olympus OM-System Zuiko Auto-S 55mm f/1.2 wins on the $350 lower typical price, and the Konica Hexanon AR 57mm f/1.2 gives up nothing measurable in return except its own rendering, described below. Condition and variant matter more than the spec sheet at these prices.

Minimum focus distance, weight, and measured sharpness are not in the catalog, so this comparison does not claim anything about them.