About the Lens:
I use a NEX 6 and have quite a few other lenses ausporbiert (16mm, Kit 16/50; SEL 18200LE; Tamron 18/200 and 18/55). So far I had as "Always-on" the 16/50 case. Now I'm on the 1670 as "always-on" switched and can only say - yes that's perfect.
The zoom range of the SEL 1670 is ideal from my point of view. In the area of good 16mm wide-angle properties in the area very good "Tele" 70mm Features. The definition is also really great. I've experienced no characteristics that would really bother me (of course, it's bigger than the 1650, but it works in my view much valent). F4 is the way in my view already really an advantage to other Sony SELs opposite.
The only point which might be valent maybe, the lens cover and bayonet fitting are ... but anyway ...
Therefore, 5 stars - for the SEL 1670 in combination with the NEX 6!