Panasonic, Leica, and Sigma will all use the same full-frame camera lenses - The Verge
Amazon.com: Dual USB Battery Charger for Panasonic DMW-BLF19 Sigma BP-61, Compatible with Lumix Lumix S5 II S5 IIX GH5 GH5S GH4 GH3 and Sigma sd Quattro Mirroless Camera, Built-in USB Cable+40cm Extension
Panasonic S1 Camera and Sigma 24-70 F2.8 DG DN Art Lens
A Look at the NEW Sigma 35 and 65mm Contemporary DG DN f/2 Lenses on a Panasonic S5. | Steve Huff Hi-Fi and Photo
Panasonic 24-70mm f/2.8 vs Sigma 24-70mm f/2.8 L Mount | In Depth Review - YouTube
Best Lens for Panasonic GH5 Video Shooters: Sigma 18-35mm ART f/1.8 | Stark Insider