Olympus E-M1 Mark II uses a Sony-made Micro Four Thirds image sensor.
Chipworks dissembled the E-M1II camera and analyzed the sensor. After tearing it down they confirm the camera uses the “Sony IMX270” sensor. According to this report, the sensor on the flagship Olympus EM1 Mark II features phase detect as well as contrast detect AF points.
It is important to underline that the sensor isn’t commercially available to other camera manufacturers. It could be a sign that the sensor could be designed by Olympus and developed by Sony.
Olympus E-M1 Mark II Uses Sony-developed Sensor
The OM-D E-M1 Mark II features a high-resolution 20.4MP sensor and TruePic VIII image processor. The high-resolution Live MOS sensor offers fast shooting performance, along with impressive image quality. As a result the sensor provides an expanded sensitivity range up to ISO 25600, and 4K video recording capabilities.
The E-M1 Mark II is ideal for sports and wildlife shooting, the sensor and processor combination burst shooting rate of 60 fps when working with the silent electronic shutter function and single-shot AF, or 18 fps with continuous autofocus. If working with the mechanical shutter, up to 15 fps with single-shot AF is possible.
We know that several Panasonic cameras sensors are made by Sony. It’s unknown if the GH5 also uses the exact same sensor or a slightly modified version.