I have tried many standard zooms and I kept the 16-55G, which I bought used for a reasonable price. IQ is just superb at all focal lenghts and even wide open in the corners. I also like the very fast AF performance and that it starts at 16mm, so I usually do not take an additional wide angle lens on trips. Downside: quite large, no OSS.
The Tamron. Surprisingly, background blur is noticeably better at 70mm 2.8. For portraits it is a great choice. I was also surprised by its strong OSS performance. I eventually sold it for its poor IQ at 17mm outside of the center of the frame. I think this lens suffers from problems with field curvature. It is also very heavy and large. AF is ok but not as good as the 16-55.
The Sigma. I absolutely love the tiny size and its great IQ. I sold it because 18mm was not wide enough for landscape shots so I always carried the 10-18 and kept changing lenses, which I hate on trips. Also, AF is not as fast as with the 16-55. You will notice that with running kids.
The Sony 16-70Z. Perfect focal length, compact and lightweight. At F/4 not as fast as the former three options but at 70mm still a good portrait lens. For me it was quite unusable as a landscape lens for its softness at 16mm.
The Sony 16-50PZ. IQ okay at F8 but soft wide open. Too slow. Tiny size, though.
The Sony 18-135: Good IQ (deteriorating towards the long end). AF ok but not as good as the 16-55. For me, 18mm is not wide enough and the lens is generally too slow, becoming 5.6 very early, I think somewhere between 50 and 60mm.