One small detail but one that really makes the line between "buying" and "not buying" for me: FOCUS PEAKING.
Having tried that on Sony, this is by far the most underestimated detail which makes enormous difference for manual focusing with fast lenses. I couldn´t believe the accuracy I could get with that! And I believe that is just a firmware matter, isn´t it? Why is it being ignored on lens-interchangeable EVF cameras...!?