Among the fast zoom lenses for full frame cameras, 24-70mm focal range and constant f2.8 aperture combination must be the most popular one. Below is a real life size comparison of the 24-70mm f2.8 lenses from the Big Four: Nikon Nikkor Z 24-70mm F4 S VR S vs Panasonic Lumix S Pro 24-70mm F2.8 vs Sony FE 24-70mm F2.8 GM vs Canon RF 24-70mm F2.8L IS USM, followed by the specs and feature comparison.
Tallest: Panasonic S 24-70mm f2.8 at 140mm
Heaviest: Panasonic S 24-70mm f2.8 at 935g
Shortest: Canon RF 24-70mm f2.8 and Nikon Z 24-70mm f2.8 at 126mm
Lightest: Nikon Z 24-70mm f2.8 at 805g
(Click the image to open the larger version)
As seen on this comparison image, the size and weight difference between these lenses are not as significant as we have seen during the size comparison of 70-200mm F2.8 lenses where Canon RF 70-200mm F2.8 is clearly smaller in length at its shortest compared to all other competitors, thanks to its rotary (extending) zoom design.
Next is the spec and feature comparison of these 4 24-70mm f2.8 lenses: