Tamron has shot for the stars here and has generally landed it. Yes, the A058 is big, heavy, and expensive, but not unusually so in any category. What is unusual, however, is the genre-busting zoom and aperture range [...] Autofocus is awesome [...] and the build and weather sealing of the lens is awesome. It does have the weakness of poor flare resistance in certain situations.
Sony Alpha Blog
It is a unique lens among all the ones available in Sony E mount: for those who want a single lens for wedding or fashion shooting [...] Sharpness is excellent wide open up to 50Mpix camera, but the lens suffer a bit wide open on the A7RIV (61Mpix) [...] Bokeh balls/ Background blur >70mm / color rendition , AF are very good. The main downside of this lens is its weight (1165g) and fatness.