With all due respect, that statement is the fiction. Anyone who thinks that the high ISO noise of any 4/3 camera can compare with full frame, for example, is living in cloud cuckoo land. However, what IS true is that that might not be remotely important to the photographer in question - if you seldom use very high ISO settings, then it simply doesn't matter. The choice of camera is always a compromise - it's up to the individual to determine what aspects are important to him/her. In other words, Rob hit the nail precisely on the head with his helpful comments.