Inglis, I definitely agree with the statement that the Leica R 60mm Makro produces warmer colours than the Zeiss ZE 100MP, which I owned, and sold for that reason (slightly clinical, cold look).
But I defintely wouldn't call the Leica Canon-like. I owned a EF-100 macro, and found the shots sharp and detailed, but lifeless, and with colours that weren't particularly elegant. I briefly tested the newer IS version, found the colours improved, but not enough to jump ship.
My experience with other Leica lenses is limited. Tests with a M-mount Summicron 90mm f:2.0 and a 24mm Summarit or Elmarit also yielded colours which I liked more than what I get our of my Zeiss, but the Summicron was not very sharp, and the 24mm yielded colour shift on my NEX.
Hence my deside to revisit the issue with a 5N and a good experience with the R 60mm.