Maybe Bernard is away shooting pictures just now...
But the Leica "look" in photographs. This has been denied; this it has been held up as gospel; but in my own case, while I never did own Leica, I did process and print from it.
My experiences are this: in black/white prints I saw a difference between Nikon and Leica as I was printing side by side, same film stock, same development chemistry. I can't properly qualify the difference, but it was certainly there; perhaps I saw more mid-tone differentiation and less overall contrast?
I also made some Cibas from Leica originals, but though the trannies looked superb, Ciba didn't allow enough DR to work very well. That was common to all cameras, though - just a problem with the Cibachrome system. (Yes, masks could be made, but a normal studio such as the one that employed me never had the time or budgets for all that stuff, and when doing Ciba for my own clients, the same unhappy logic applied in the few instances folks wanted colour print.)
In conclusion, I think that today, in a digital world, the question and its answer have changed because the variables have, too.
If Leica lenses really can give more micro-contrast on a sensor, as I think they could on film, without making too much contrast overall, then the lenses have a quality that PS should be able to do miracles with because colour, today, can be so operator varied as to make it pretty much impossible for a "standard" colour look, native to one manufacturer, to survive the digital process itself. Let's face it: if Leica glass gives more intrinsic, tiny tonal separation than others, how can Leica not produce a better final image, operator skills and intentions being equal?
A digital R6 might have been the camera that I would have traded everything else to own, in retirement, where the needs are different. As much as I am in love with the M rangefinder camera's looks, always was, I know that those who advised me recently about my probable problem were I to go rangfinder are right. It's a mental approach to seeing, which has been created by a lifetime of usage and custom. Old dog problem. I think old horses suffer from this too.
Rob