Panasonic lx3, canon s90 and g series were the early pioneers of this type of p&s, then cameras like the x10, s100, lx5, (nikon one, and pentax q in terms of sensor size) up'd the ante. But due to limitations in high iso performance, they tend to not intrude the m43 space in terms of someone making a decision on which camera. Now with the Sony rx100 blowing the doors off of m43 space in terms of both iq and iso, what used to be easy decision points are blurring the lines for p&s using small sensor or just go m43...
Rx1 changed the game in terms of what to expect from the large sensor p&s world that was owned by x1/2, x100, and others. the saving grace for Sony competitors is price.. If rx1 was 2k or 2800 with evf, it might have been different story.. By early next year we will c how well the rx1 does in the market
Next year is going to be interesting to c how others respond to the Sony pair of p&s... Choice is good and we are going to benefit
Ps I have the rx100 and love it.. It retired my lx3... I have an x100 and dont plan to upgrade to an Rx1..