Wasn't gonna reply, but I have to put my two-bits worth in.
I have a CZ16-80, and think it has taken some of the best images possible. Love the IQ.
But, the bug in the ointment is the innards of the beast. My auto-focus died a couple of years ago, and Sony Canada said the best they could do was offer me a new lens at a "low" price... it was $669 at the time, plus taxes.
Repair, at a local Vancouver camera repair business... CamTex... cost me roughly $450. The "fix" lasted for 18 months. Autofocus died once more. (I can still focus manually, but my eyesight is not what it used to be, so have to rely on auto-focus for speed). The tech I spoke to said that the lens part that has 3 plastic "guide" (?) rails and is really NOT as robust as it should be for the size of the glass components. He said the part should of been brass, or at least aluminum. Other than that, the lens is a perfect picture taker... I just might get it repaired once again, because I miss it. My "new" 16-105 gives sharp and colourful images, but they don't have that special contrast and colour quality I was used to with the 16-80. And, it is really, really prone to flare. You don't want any bright doorways or suns peeking into the pictures you take. Nice lens, really, if I did not have anything to compare it to, but since I do, I really miss the Sony-Zeiss 16-80... it did NOT have the flare issue!
If you can be very careful with it, the Zeiss lens is worth the $1000 it now costs ($1050 in Canada now). It just is not constructed robustly enough. I really am not rough with my equipment, but the tech said that even in a padded case, if you put it into the trunk of your car, or elsewhere a little more firmly than normal, he said the plastic focusing rails will break. He has supposedly repaired "a few" for the same problem. (Actual number wasn't specified.)
If they bring out an upgraded model that addresses those issues, it would be a killer lens to go with your Sony non-FF cameras.