What to choose?sony nex3n or Olympus e-pm2

Hello..I am thinking now between olympus epm2 and the Sony nex3n.

The advandages of sony is that will cost me around 300 euro and the epm2 around 350 euro.50 euro less.Also in dxomark shows better low light performance and overall a bit better ratings that the epm2.Now the advantages of the epm2 is that i already learn how to use this camera because now i have the epm1.and i like very much the super control on the screen..as now i am learning to shoot manual and never had dslr before.Although another one advantage for epm2 that i have already the sigma 19mm for m/3 mount.So what is your oppinion to buy?i think we have to take in mind the follwing.Image quality of both cameras (sony a bit better),I already have the sigma 19mm to use it with epm2..would this add some better rating over the sony nex3n with stock lens?The sony nex3n i can buy it around 50 euro cheaper this is also an advantage over the olympus.What about the sonys sensor is bigger better than the epm2s?but in the other hand olympus jpeg engine are better.Also is very good that there is on screen super control panel and i learn in before in epm1.What about the sony nex3n ?have similar control panel?or is more difficult and not easily to access.In olympus onscreen adjustmens i can do very fast and easily..Also in the future maybe i will buy an extra lens but at the moment no..So what you think about my decision.thank you