Which is better for travel?

The Sigma. At 290 g and 74.5 mm long it fits a small bag and stays on the camera all day. The Sony is 695 g and 119.9 mm long, and it only makes sense on a full-frame body.

Can I use the Sigma on a full-frame Sony camera?

Only in APS-C crop mode, which drops resolution to roughly 10 MP on a 24 MP body. The Sony FE 24-70mm covers the full frame.

Is the Sony worth the extra money?

For paid full-frame work, yes: sharper corners at f/2.8, faster autofocus, 11 blades and weather sealing. For hobby shooting on APS-C, the Sigma covers most of the range for far less.

Which focuses closer?

The Sigma, at 12.1 cm with 1:2.8 magnification at 18mm. The Sony reaches 0.21 m with 0.32x, so it is close but not as close.

Which has better bokeh?

The Sony, with 11 aperture blades and full-frame depth of field at f/2.8. The Sigma's 7 blades and smaller sensor give busier out-of-focus highlights.

Do either have image stabilization?

No. Both rely on in-body stabilization in the camera.

Sigma 18-50mm f/2.8 DC DN Contemporary vs Sony FE 24-70mm f/2.8 GM II

Buy the Sigma 18-50mm f/2.8 if you shoot Sony APS-C and want a light, bright standard zoom for travel and everyday use. Buy the Sony FE 24-70mm f/2.8 GM II if you shoot full-frame and need G Master sharpness, fast autofocus and pro build. The price gap is large: $499.99 at Best Buy for the Sigma as of November 4, 2026, against $1,829.99 at eBay for the Sony as of the same date.

Today the Sigma 18-50mm f/2.8 DC DN Contemporary costs $1,949.00 less at its best price.

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