Canon EOS M vs a entry dSLR (Rebel).

Hi, I've seen how well even the dSLR capture photographs at the base ISO.  If one is looking at cityscapes either bright sunlight or on a tripod at night (dusk/dawn).  How does a EOS M compare to one of the entry level Rebels?  Is the noise still ok for long shutter speeds?  The only experience I have is a Canon A510 P&S so my knowledge is quite limited..

I understand the EOS M is a APC sized sensor.  So a compare might be a EOS M vs a Rebel T2i/3i.  Speed isn't the essence of course, just static images.  Lowest ISO.

Thanks.