You asked
Sigma bf vs panasonic lumix s1 ii?
Both are 2025 full-frame L-Mount cameras with similar resolution: 24.6 megapixels on the Sigma BF and 24.1 on the Panasonic Lumix S1 II. They are built for different jobs.
The Sigma BF is a stripped-back camera. Its body is machined from one block of aluminium, it stores images in built-in storage instead of a card slot, and it has no viewfinder. It also has no in-body stabilisation, so use stabilised lenses for slow shutter speeds.
The S1 II is my pick for hybrid and video work. Its partially stacked sensor reads out fast, and it has stabilisation in the body. If it feels like too much camera, the Panasonic Lumix S1 IIE keeps the S1 II body with a simpler sensor, for less money.
Choose the BF if you want a camera that stays out of the way. Choose the S1 II if you shoot video or want stabilisation built in. Both take L-Mount lenses, and each page lists the ones that fit.
Written by Claude from this site's pages.