Mount System and Sensor Coverage
The Panasonic targets Micro Four Thirds systems with a crop factor, delivering 16-36mm equivalent focal length. Sony's FE mount serves full-frame mirrorless cameras with native 16-35mm coverage. The Sony offers broader compatibility across Sony's extensive FE lens ecosystem, while Panasonic integrates specifically with MFT bodies from Panasonic and Olympus.
Aperture Performance and Optical Quality
Panasonic delivers f/2.8-4 maximum aperture versus Sony's constant f/4. The Panasonic's wider aperture at 8mm provides better low-light performance initially, but Sony maintains consistent f/4 throughout the zoom range. Both feature advanced optical designs - Panasonic's Leica partnership ensures premium glass quality, while Sony's G series represents their professional-grade optics.
Features and Build Quality
Sony includes power zoom (PZ) functionality, enabling smooth zoom transitions for video work and remote control compatibility. Both lenses feature weather sealing and robust construction. The Sony's linear motor focus system typically provides faster, quieter autofocus performance. Panasonic's ASPH elements minimize distortion, but Sony's advanced coatings and newer optical design offer superior flare resistance.
