Verdict from Photozone:
The Sony FE 12-24mm f/4 G is a bit of a surprising lens in a couple of ways. Upon first contact, you will notice how small it is compared to similar (DSLR-)offerings. It’s even more obvious in term of weight (565g vs 1150g for the Sigma 12-24mm f/4 HSM ART). Now you may expect that this comes with a couple of compromises but there are actually only a few.
The comparatively low weight has no real impact on the quality of the construction of the lens. It is built to professional standards including weather sealing.
A final word of caution – the Sony FE 12-24mm f/4 G is an extreme lens really. Such lenses are addictive, yes, but they are notoriously difficult to use at their widest settings. So before spending that much money just make sure that this is really what you need. However, if ultra-wide perspectives are simply your thing then the Sony is a no-brainer. Highly recommended!
Read the full review at Photozone.
Read more: Best Sony Full Frame E Mount Lenses.