The OM System OM-1 Mark II leads with 8.5 EV stabilization and Live GND features per official specs while the Sony A7 IV counters with a 33MP full-frame sensor for better low-light results. The OM-1 Mark II scores higher overall due to its 2024 release and IP53 sealing versus the A7 IV's 2021 design. Choose the OM-1 Mark II for rugged outdoor use and the A7 IV for full-frame image quality.