I'm not saying to use any equipment that doesn't give you an advantage.
Leaf Shutters are ok, though like the Hasselblad H the top shutter speed is only 1/800th which really doesn't
freeze fast motion.
It's also a sliding scale that the higher the shutter, the slower the duration the less power you have available because your cutting into the flash like continuous light.
I personally think flash duration is the only way to really freeze fast moving subjects.
I shot this series with Acute monoblocks, but mostly older photogenic monoblocks. I have about twenty of them and acquired them for years. They're not the sexiest
equipment but they work and produce a lot of light at low settings.
Anyway, the p30+ and Contax is what I had, the photogenics worked in testing so I shot the gig.
I did briefly test an H series in this configuration and didn't see any advantage, though shooting on white with a lot of ambience bounce, the H series cs does help.
We all get caught up a new camera will do something different but sometimes (actually manytimes) we already have the camera that will get to where we want.
But back to the Leica. Leica glass has always been expensive, though seems to hold it's value better than most lenses.
I bought an S2 because I wanted to and enjoy it. It's very well built feels like quality and shoots a good file. Is it a better deal than a Nikon . . . to me yes, to others
probably not, but if cost is an issue, Contax or H series lenses are fairly inexpensive (in the big lens world) and work very will with the S series.