My first surprise moment was actually, that new Panasonic Lumix GX1 is smaller than my previous GF1. Second wow was how fast it acquires focus(!!!). As we know, phase-detection AF, used in DSRL’s are superior to contrast-focusing hybrids. Not anymore. New Panasonic Lumix GX1 focuses as fast as any prosumer DSLR.
I really haven’t push it to the limit, but my primary reason was better ISO and faster focusing in low light conditions.
And one more thing. GX1 was available only with pretty crappy zoom lenses. Camera like that deserves only good fixed focus glass!