This is an approximative size comparison between the new Tamron 17-28mm f/2.8 and the Sony 16-35mm f/2.8.
Note: It’s a bit difficult to make an accurate size comparison. We only have one image of the new 17-28mm lens which has a slight tilt that is different from the Sony. Please let me know in the comment system if you have a 100% accurate comparison. Thanks!