The e-10 and e-20 do not use sensors even remotely connected to the sensor in the e-1. The e-1 used a 4/3 sized sensor. The e-10 and e-20 used a 2/3" sensor, in other words, a sensor size typically used in a compact digicam. To put it in modern perspective, the e-10/20 sensor is the same size used in the fuji x-20 camera. Moreover, it is only marginally bigger than the sensor used in the modern XZ-x series compacts. The sensor in my Nokia pureview 808 (1/1.2") is even bigger than the e-10/e-20. In my opinion, the best 2/3" sensor camera that Oly ever made was likely the camedia 8080.