The Tamron 28-75 f2.8 constant aperture lens is one of my favorite lenses for the Sony a7iii. I usually use prime lenses but have been using this lens almost exclusively for the past few weeks. It’s smaller and lighter than the GMaster 24-70 but performs almost identically. I like having 75mm on the long end vs. only 70mm. The built quality is great, even though plastics are used to reduce size and weight. This lens is easy to carry along with other lenses in my camera bag. GMaster lenses are incredible but the size and weight has made the Tamron 28-75 the preferred option for me. Bokeh is subjective but that is the biggest difference that I’ve observed between the Tamron and the GMaster. I’d give a slight “win” to the GMaster for bokeh. #Tamron