I'm glad that my inquiry resulted in this rigorous conversation. There is a lot of insight, perhaps a little argumentative (that's natural), and very enjoyable to go through.
Anyone who is interested in MF would have to forego portability, unless a folder is one of the options. Personally I don't like folders, particularly in extremely humid conditions the bellows will quickly get infected by fungi.
The debate of 35mm vs MF is quite unfounded; each has its own place, demands, philosophy, and usage. I simply started the thread with identifying an `equivalent' system, or one that comes closest to Leica, as my objective, in terms of quality of glass and not portability and other obvious differences between 35mm and MF.
There is also a clear distinction between Zeiss glass and Leica glass, those who understand will perhaps just characterize them by simply ``Zeiss'' and ``Leica'' instead of going deeper and adding further epithets to them 🙂. It's my personal opinion, going by the pictures I've seen, that the latest Mamiya glass comes closest to mimicking the Leica characteristics that I've seen in 35mm actual Leica glass. But my opinion formed simply seeing the pictures; actually experimenting with lenses is a complicated and challenging matter, keeping identical conditions throughout all tests, etc, and I certainly haven't seen such a scientific comparison before.
I'm eager to see where we go from here. This is developing into a nice thread 🙂