nex-7 or nex-6 which is ultimately better?

wifi could be useful for the wife, so she can take a picture and share with her phone etc. that could be useful

i also believe the 6 has a better auto focus right? and with a higher iso there is a less noise then the 7...

in the real world the 24mega pixel is not going to be justified as i am not going to be doing large prints?  maybe max A2 CANVAS..