I can't answer your question myself, but another member just got her SS2011 black rh city and shows the picture and describes her black as more blue black...check it out at the thread with this title.
Newbie Reveal: sent City S/S 11 not F/W 10 - does this compare??
both 2010 & 2011 are very nice, but just by looking at the pictures, the 2010 one is more jet black than the 2011. The 2011 looks like it is a blue black color.
it's amazing how despite 'natural' differences in colour because of the processing of the leather, BB can still come up with different shades of black for different seasons.... truly shows how much quality and effort you get with them