Which is better for portraits?

The Sigma. Its 17-40mm range and f/1.8 aperture give flattering compression and background blur. The Fujifilm's 8mm is too wide for conventional portraits.

Which is better for interiors and architecture?

The Fujifilm. Its 8mm field of view captures whole rooms and tall buildings in one frame. The Sigma's 17mm end is only moderately wide.

Which is better for video?

The Sigma, for its constant f/1.8, internal zoom and minimal focus breathing. The Fujifilm is fine for gimbal and vlog work where its small size helps.

Can I use the Fujifilm on a Sony body?

No. The XF 8mm is Fujifilm X mount only. The Sigma comes in Sony E and L-Mount versions.

Is the Fujifilm worth $769.95?

It was $699.95 on November 7, 2026, so $769.95 is near its recent high. If you need an 8mm prime on Fujifilm, it is the main option; otherwise wait for a drop.

Both are weather sealed and internally focusing, so build quality is comparable. The Sigma's larger glass and zoom mechanism add more parts that can wear.

Sigma 17-40mm F1.8 DC Art vs Fujifilm XF 8mm f/3.5 R WR

These are not substitutes. The Sigma 17-40mm F1.8 is a fast standard zoom for APS-C mirrorless bodies; the Fujifilm XF 8mm f/3.5 is an ultra-wide prime for Fujifilm X bodies. Buy the Sigma if you want one bright lens covering portraits and landscapes; buy the Fujifilm if you shoot Fujifilm and need a 12mm-equivalent field of view. The Fujifilm is $769.95 at Newegg as of November 8, 2026, with a low of $699.95 on November 7; no price was given for the Sigma.

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