This has been debated for many many years.. I'm sure Nikon and Canon has pretty much closed the gap between their lenses and lenses from these legendary German lens makers.
So far only Canon EOS bodies allows other lenses like Leica, Nikon and Carl Zeiss to be mounted using adapters apart from Canon and made for Canon lenses and Carl Zeiss is making ZF lenses for Nikon mount.
Does anyone have any experience that lenses from Leica and Carl Zeiss gives a different feel to the same scene when compared with that shot with a Canon or Nikon lens using the same body (we want to eliminate the differences contributed by the body).
Are Leica and CZ lenses that legendary still or have they lost their edge because the Japanese has caught up?