What exactly is your argument in favor of M43? You already own it? It's
good enough for most people? It's compact?
maybe I'm missing something at DxOmark because I don't obsess over these statistics but the M43 EPL3 isn't close to the APSC sized sensor K-5 or NEX5.
DxOMark - Compare cameras side by side The EPL3 scores similar to my K200D which was released 4 yrs ago as far as I can tell. I've already said that the M43's platform is very good and it could be perfect depending on your needs. Ideally I get a high end all the bells and whistles K-5 or replacement and a M43 or similar as a compact (with two primes) for travel when size is really important (like long distance hiking or in bike panniers). But right now I'm concentrating on one system and that's Pentax APSC.
I'm getting something this summer but I haven't really decided which is perfect. My biggest concern regarding the K-01 at this point is battery life and lack of a AA grip (AFAIK). It's not unusual to go a week or more when traveling w/o a good recharging source and not being able to take photos would suck. the lack of an EVF and WR are also factors which could push me to getting the outgoing K-5 model.