Sony RX1 vs Sigma DPM (1 or 2)

On paper, RX1 looks to be the better camera for street shooting (much quicker in all aspects).  But, you have to go with what your gut tells you - you gotta be happy with your choice.  You can buy both DP1 and DP2 (and some) for the same money as one RX1.  Slower cameras have been used successfully for street photography.