In before the B&W haters... Also, calm down.
If there is truly a progression from the S1 to S2, it would most likely be in refinement, but nothing huge. The larger factor is going from the CM9 to CM10 and the placement of the tweeter on top. IMO, this is when the magic happens in the CM or newer 700 series (10 or 5). You should notice a difference between the two so, sit down, relax (smoke if you got 'em - or maybe a nice brandy) and enjoy!