I've been looking for a new digital camera, so I took a look at the S520 specs. It looks like they're relying on high ISO for the low-light shooting. But the coolpix has a maximum ISO of 2000, while if you look at the Fuji Finepix F50, it's highest ISO is 6400, so it would have greater light sensitivity.
Also, the S520 claims a macro focal range of 15cm, while the F50 is 5cm, allowing you to get a closer shot, should you want.
DPReview gives the FinepixF50 a (barely) "Highly Recommended" rating, and the price is roughly the same as the Coolpix S520. They haven't reviewed the S520, though.
Standard disclaimer...not related to fuji...etc. etc., but my very first very simple P&S digital was a Fuji, and it took great pictures despite its lack of features, so I have great fondness for the brand. (My current is a Canon 620 which also takes great pictures, but is heavy and most definitely not pocket-sized.)
Note: It's specifically the FinepixF50fd to which I refer.
Edited by prasantrin, 24 April 2008 - 03:58 PM.