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Carlinwasright has your answer!

Another example: The Nikon F 50mm /1.4 AF-D has 7 lenses in 6 groups. Thats 10 lenses less than the Nikon Z. BUT: Even in old times the step from 1.4 to 1.2 was relativily huge, the 1.4 weighs around 260g, the 1.2 around 380g…thats nearly a 50% increase

The modern prime lenses for digital have - in the lab! - much better optical qualities than the old primes like Leica or Zeiss that are around for literly decades. If anybody can see this differences in real life is a complete different discussion.