Sony A7 IV wins for stills photography with its 33MP full-frame sensor providing 2 stops better low-light performance than the G9 II's Micro Four Thirds per DXOMARK data. The Panasonic Lumix DC-G9 II counters with superior 6K video and phase-detect AF updates from 2023. Both share strong IBIS but the Sony's ecosystem gives it broader longevity per Wirecutter comparisons.