I've been looking for a Pan 14mm on eBay. There seem to be a lot with bodies, though I'm sure the sellers are thinking of it as the body with a lens. Most seem to be GF2/3. So I figure if I could get one cheap I'd just sell the body cheap and keep the lens. But there are also a few GX1's. I see no reason to keep one of the GF's, not a fan of the body style which is why I got the E-PM1. But if I actually were to win a GX with the 14mm? Is the GX that much better than the E-PM1? Is the sensor in the GX the E-M5 sensor?