A friend of mine has a 5n. He bought it for camping and biking trips. It was between the 5n and ZX-1. I had loaned him my Nex 3 a couple of times and he really liked it. In return he is going to let me babysit his 5n for a couple of weekends and see what it can do. Stay tuned.LOL
I did find a problem with my Nex I never really considered. I was shooting in extreme low light and was wanting to try a long exposure. You can see what I was after with Four Sticks in critiques. But the Nex couldn't focus in such low light and manual focus on the LCD was out of the question. I tried to focus manually to infinity but missed to much and gave in to the E5s OVF. It was to frustrating for what I needed.
So there are drawbacks to mirrorless cameras. DSLRs are still king of the hill for me no matter how good the Evil cameras IQ can get. Does size matter? Not really it's how you use it.lol