Amateur Photographer publsihed their detailed Tamron 28-75mm FE lens review. The conclusion:
Although this lens doesn’t offer the same level of supreme corner sharpness that you get from Sony’s professional-grade standard zooms, it’s a truly excellent mid-range example. The extra stop you gain over the Sony FE 24-70mm f/4 ZA OSS Vario-Tessar Carl Zeiss T* makes it superior for low-light shooting and enables you to isolate subjects from their surroundings easily whilst producing very attractive blur behind.
The advantage of choosing the Sony FE 24-70mm f/4 ahead of this lens is that it allows you to shoot wider, however if you prioritise a faster aperture ahead of a wider field of view and you don’t want to spend over £1000 for the privilege, this is currently the best mid-range standard-zoom going for Sony’s A7-series cameras.
It won’t take long for those who buy it to realise that they’ve made a great choice. It’s ideal for general shooting provided you enable in-camera lens corrections and don’t want to shoot too wide. Importantly, it’s not heavy or cumbersome either. Tamron has got the balance just right and I envisage it being in popular demand of new Sony A7 III users who might be on the lookout for the perfect walkabout lens.
It’s an excellent start in a new series of full frame mirrorless lenses from Tamron. One day it might also be made available in a variety of different mounts to suit other full frame mirrorless cameras.