Minolta MC Rokkor-PG 58mm 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 Minolta MC Rokkor-PG 58mm f/1.2 is cheaper. Typical used value is $480 against $500, a gap of $20. Ranges: $300 to $850 versus $300 to $900.
• The Minolta MC Rokkor-PG 58mm f/1.2 is longer at 58mm against 55mm, a 3mm difference that tightens framing slightly and increases background magnification.
• The Minolta MC Rokkor-PG 58mm f/1.2 is the older design; production began around 1966 against 1972 for the Olympus OM-System Zuiko Auto-S 55mm f/1.2 (1966-1973 versus 1972-1984).
• They use different mounts, Minolta SR (MC) and Olympus OM, so each needs its own adapter. Both reach infinity on mirrorless bodies with a plain mechanical adapter.
• Construction differs: 7 elements in 5 groups for the Minolta MC Rokkor-PG 58mm f/1.2, 7 elements in 6 groups for the Olympus OM-System Zuiko Auto-S 55mm f/1.2.

Which one to buy

On the catalog data the Minolta MC Rokkor-PG 58mm f/1.2 wins on the $20 lower typical price, and the Olympus OM-System Zuiko Auto-S 55mm 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.