What I find troubling with regards to Sony's answer to this is that they have already, within a time frame of two years, launched 6 - six - more or less overlapping versions of the A7. Still, this single model from Leica seems to be a better all-round option.
I can see where Sony's rapid upgrade path causes a great deal of frustration. However, I went from the A7 to the A7r2 and feel very little overlap in their functionality.
I also cannot see where this giant camera that lacks IBIS, low light capabilities, PDAF, canon lens compatibility, a significant native AF lens availability, Eye Tracking AF, a tilting screen, high resolution, any semblance of affordability and more can be flatly called a better all-around solution.
For me, it would represent a giant leap backwards from either my A7r2 or my Samsung NX1.
But, for the well-heeled Leica specific crowd, especially those that don't mind a large camera body, it looks like an interesting choice.
I would particularly like to see a Sony body with a high frame rate and a deeper buffer and more responsiveness in every day usage.
Hopefully, these strengths of the Leica are praised so widely that Sony begins to feel the heat.
Otherwise, I hope that Canon or Nikon makes a mirrorless with those features.
Or, I would love to see Samsung wake from its long slumber and invest in the NX1 system with more great lenses. Or release their own insanely spec'd FF body.
Or maybe the rumored November Sony camera body already incorporates those features.
-Bill