I agree with Dnenni, Samsung having IC division and Fab together will always leave some hesitation in customers mind where they will be handing off their GDS to a competitor company.
Samsung having modem (competition with Qualcomm), hummingbird processor (Apple/Nvidia) wont let these comtomer come close to their Fab.
I wish they have started the Fab as a seperate company, probably under Samsung group but as a separate sister concern.
Samsung is indeed a foundry, they just extend their muscle power with this move. Only few compainies could offer 20nm an they are one of them. Samsung is competing with everybody almost everywhere in consuming electronics. Now at foundry level no big suprise as #sranje mentioned they stare to top.
Right on schedule - as predicted - and a major "foundry" achievement. However, Samsung's key objective for decades is elsewhere - to become the #1 IC vendor (displace Intel).
For the first time, Samsung has a shot at achieving that goal (Memory, Consumer OEM/IDM,phones and appl. processors, current relationship with Apple, etc., etc