I work in the business, I know quality from crap. The reviews posted thus far are from amateurs. My impression thus far is that the 4S has extremely high quality from a camera phone and the competitors cannot compete. If you want a real review of image quality, wait for dpreview to do a comparison, not some guy who reviews downscaled videos re-compressed for youtube.
If anyone wants to send me a full-res video from the "Samsung Galaxy S2 touch pro slide" or whatever they are calling that abomination of a phone these days, I'll take a look at it.
Selling cameras or phones definitely doesn't make you an expert. Years of photography with a variety of gear will give you enough knowledge and perspective to have an informed opinion.
As an amateur photographer, let me say that arguing about which cell phone camera is like arguing about whether a Nissan Sentra or Honda Civic has better suspension. $80 ultracompact point and shoot cameras will take better pictures than all of them