C anon’s EF 24-70mm f/4L IS USM and EF 24-105mm f/3.5-5.6 IS STM are both good options as lightweight all-day standard zooms for full-frame DSLRs, the latter commonly being sold as a kit lens option for the EOS 6D Mark II. However, both of these lenses are now being listed as obsolete in some world regions, so the writing’s on the wall.
We’d go for the Sigma 24-70mm f/2.8 DG OS HSM Art lens, which is our favourite standard zoom for full-frame DSLRs. Sure, it’s heavy at a smidge over a kilogram, but it has a faster f/2.8 aperture rating that remains available throughout the zoom range, and retains optical IS. Performance and image quality are fabulous in all respects, and build quality is highly impressive as well.