Interesting. I’m just not interested enough in Leica or what the S3 is - besides a camera with slightly oversized sensor. Thanks for clarifying (and saving me the time to find it out). But in DPRreview’s text and in Leica’s product pictures is no hint at all that a mirror is involved*. They show a sensor in cleaning mode (mirror up), the sensor without camera body and the body cover - as if the mirror is not worth mentioning and “you can shoot it mirrorless” is the message to be taken.
* except the front line of the mirror mechanism when in “mirror up”.
* except the front line of the mirror mechanism when in “mirror up”.