It's nice to have options. Nokton a bit more vintage in a way, simera a bit more modern. I quite like them both but everyone has their own preferences.
I want to get 28-50 in m-mount just incase they update the e-mount later but that damn notch at 0.7m.
Maybe the leica users find it useful, but to me it's kind of crazy to add a spot that's sticky on the focus ring.
Feel like it gets in the way with the 28mm. I like these for people shots and you need to get close more often with the 28.