CameraLabs tested the new Tamron 70-180mm lens and concluded:
It produces very good image quality including a soft Bokeh and very usable close-up performance in a package that is much smaller, lighter, and cheaper than Sony’s FE 70-200mm f2.8 GM. It may not have all the bells and whistles of Sony’s professional zoom lens and its biggest disadvantage is the incompatibility with teleconverters. But it still is a compelling alternative to the Sony and clearly earns a recommendation!
Also Photographyblog published the full lens review:
Overall, unless you really, really need the extra 20mm reach of a “true” 70-200m zoom, the new Tamron 70-180mm F/2.8 Di III VXD is a truly unique lens that performs exceptionally well in almost every regard, and is therefore a deserved winner of our coveted Essential award.
Tamron 70-180mm FE lens is in Stock and/or shipping here:
In USA at Amazon, BHphoto, Adorama and FocusCamera
In Germany at FotoKoch DE, Amazon DE, Calumet DE.
In UK at Amazon UK, WexUK, ParkCameras.
In Amazon EU stores at Amazon FR, Amazon IT, Amazon ES, Amazon NL.