This is an interesting thread and I for one is pleased it has not turned into a Canon/Nikon Olympus bashing topic ( I have been guilty of this in the past).
All cameras have good and bad points, and all things aside the appeal of the four thirds system is it's reduced size and weight. It would be a huge mistake to judge any camera on hi ISO performance alone, while this is to me a very desireable aspect I also apreciate it's not to others ( and not always to me)
ISO1600 is plenty good enough for almost anything I shoot now, one day everything will do this with ease. Bring it on, then we will have a level playing field and we can all talk about something else.
DR I guess would be next on the list, and in ther case of Olympus a more important thing to fix.
What will the next five years bring...oh boy I do wonder.
PS the range of the 12-60 would be ideal for me...damn you Nikon for keeping the standard decent zoom so short.