Depth of Field

Micro Four Thirds - APS-C - Full Frame

The smaller the format, the greater the depth of field.

A 25mm f1.4 on Micro Four Thirds is equivalent to 31mm f1.8 on APS-C and 50mm f2.8 on full frame.

http://www.cambridgeincolour.com/tutorials/digital-camera-sensor-size.htm