Jordan Steele from Admiringlight posted the full Tamron 28-75mm review and the conclusion is:
The Tamron 28-75mm f/2.8 is a fast standard zoom that is an excellent value for money. It’s rather sharp, and produces very pleasing images with a good overall image rendering. Bokeh can get a bit chunky at times, and there’s some distortion that you’ll have to correct, but when taken as a whole, the optical performance of the lens is quite good. Considering the reasonable $799 price tag, and the very high price of its competition, the bang for the buck is the best among all the standard zooms for the full-frame E mount.
In addition to the good optical quality and affordable price, the Tamron succeeds most due to its compact nature. In comparison with the Sony 24-70mm f/2.8 GM, the Tamron 28-75mm is so much lighter and easier to handle as a walk-around lens that it would be hard for me to entertain the GM even if their cost was similar. While improvements could be made, it’s a very solid effort from Tamron, and will fit the bill for a wide range of Sony shooters. I started out a bit wary of the lens, but have grown more and more fond of it the more I’ve used it. I’ve found it to be a very versatile lens with very good image quality, and it’s earned a permanent spot in my bag.
Tamron 28-75mm FE lens at BHphoto, Amazon, BuyDig, FocusCamera and Adorama. In Europe at Amazon DE and WexUK.
Tamron 28-75 F2.8 vs Sony 24-70 GM by Max:
Tamron 28-75 F2.8 vs Sony 24-105 F4 by Max:
And here is the Tamron 28-75mm f/2.8 Di III RXD lens Review by Patrick Murphy-Racey:
