whenever i backup for weddings, the main photog lends me a d700. this cam lets me shoot cleanly at iso2000. i've been looking at sample photos from the fuji s5 at 1600-2000 and its not that bad. of course, since its a fuji, it'll be dreadfully slow.
have you ever used the s5 at iso 1600 and/or higher? please show sample pics and comment on the noise. apart from flickr, here's the only site where i was able to get sample shots at the mentioned iso range.