A tale of two lenses. The first is a Zeiss Jena 85/2 Sonnar in Leica Thread Mount, the second a Leica 75/2.4 Summarit. The Zeiss is likely a late 1940s lens assembled from WWII-era components while the Leica was made in 2016. Photos via a Sony A7iii + Techart Pro AF adapter for M mount lenses. Both lenses wide open at minimum focus, 90 & 75cm respectively, with a little additional extension from the Techart. Both photos cropped (not much) for near-identical framing and also processed in iOS Affinity Photo close to identically.
IMO there's very little in it. The Leica has a bit more resolution & snap while the Zeiss has more focal length & speed. Neither impedes anyone from taking a compelling photo nor is capable of turning sows' ears into silk purses.
(I took the two critter pics above with the Zeiss Jena lens.)
-Dave-