First full Sigma 24-70mm f/2.8 FE english review by Marc Alhadeff: “excellent standard zoom for the A7RIV”

Sigma 24-70mm FE lens at BHphoto, Adorama, Calumet DE, FocusCamera. WexUK

Marc Alhadeff from SonyAlpha.blog reviewed the brand new Sigma 24-70mm f/2.8 FE lens and concludes:

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The Sigma 24-70mm F2.8 DG DN Art (1200 euros) is an excellent standard zoom for the A7RIV.

Globally it is the best in its category for the A7RIV and the only one to resolve fully the 61Mpix sensor (only in the centre), its main weakness is the 24mm focal length where the Sony 24-70 F2.8 GM does consistently better

Pros

Excellent to outstanding centre sharpness on A7RIV between 35 and 70mm
Moderate price
Excellent smooth blurry background
Very Good Bokeh Balls with no artifacts and well rounded
Very Good build quality and ergonomics
Very good color rendition
Weather sealed
Short focusing distance
Fast and reliable and silent AF
Very Low CA except at 70mm (moderate)

Average

Visible distorsion and moderate vignetting but that should be corrected in a future Lightroom Lens profile (not worse than the Tamron or the Sony)
Resistance to flare is not a the level of what we have on Prime but Sony and Tamron have also same issue
Weight 830g (but lighter than the Sony 886g)
24mm sharpness less good than Sony but roughly similar to Tamron at 28mm
Corners sharpness only reaching very good levels max and good at 50mm

Cons

None at this price point

For A7III I would still recommend the Tamron 28-75mm F2.8 Di III RXD (900 euros) as the extra gain in performance of the Sony and Sigma won’t be noticeable most of the time

For the A7RIII and mostly for A7RIV:
if your main usage is around 24mm or are looking for very good consistency centre to corners around 50mm go with the Sony FE 24-70mm F2.8 GM
otherwise the Sigma offers superior performance mostly in centre (e.g. for portrait at 50 & 70mm) and for 40% less cost

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Sigma 24-70mm FE lens at BHphoto, Adorama, Calumet DE, FocusCamera. WexUK