After seeing so many images at f1.2 and f1.4, I have 2 thoughts about this new zoom lens and the FE lenses.
(1) I wonder if f4 is sufficient as a normal zoom lens that is not UWA nor tele. While it works for the wide end but the tele end may not have the subject isolation that we have seen so much. 70mm f4, enough? I know we wanted smaller lenses. I wouldn't mind a 21-35/4 + 35-80/2.8 combo. The UWA can be a 14-21/5.6. I hope Sigma or Zeiss will tinker and experiment with a new focal range of zooms.
(2) The subject isolation of FE lenses seems to lack character. It is just so clean, high contrast, sharp and predictable. Imagine anyone with these lenses crank it to widest aperture, you will get tonnes of similar images. Bokeh is the artistic quality of OoF area. Can the term bokeh still be used to described the OoF of FE lenses. It is almost a guarantee that you get these similar effect once you crank it wide open. There is no swirly bokeh, there is no light falloff, there is no abrupt transitions, etc.
Anyway, just my opinions. I am grateful to Sony for A7 though.