I shot Olympus and Pansonic M43 for several years before going Sony FF. I cleaned a spec of dust one time ever on my G9 with a blower. I take my cameras hiking as I do landscapes so I’m constantly in rough conditions.

My Sony FF gets so dirty sometimes even the cleaning function and blower doesn’t do it and I resort to sensor wipes. The sensors literally act like dust magnets for me. It doesn’t matter whether the lens I’m using is weather sealed…even without swapping lenses after a few weeks of use I have dust showing up in my photos. It only takes on lens swap and I’ll be cleaning numerous dust specs from the sensor in post. Been through two A7R2s that both do this.