Here is the size comparison of new announced Tamron FE 17-28mm f/2.8 Di III RXD Lens (B&H Photo Video) with Sony FE 16-35mm f/2.8 GM Lens and Tamron 28-75mm f/2.8 Di III RXD lens (Amazon/B&H Photo/Adorama).
Sony Alpha Mirrorless Cameras, Compact Cameras & Lenses Rumors
Here is the size comparison of new announced Tamron FE 17-28mm f/2.8 Di III RXD Lens (B&H Photo Video) with Sony FE 16-35mm f/2.8 GM Lens and Tamron 28-75mm f/2.8 Di III RXD lens (Amazon/B&H Photo/Adorama).