Reply to S4 sound quality question ?

Hello all DJTT
I want to buy s4 but a friend of mine /dj/ told me that the sound quality wont be as good as turntable or cd player and he told me that its better to buy 2 pioneer 800's and a mixer and the sound will be better ... and i've read that the quaity of the s4 is better if its connected via audio 4/8/10 dj ??? I want to have s4 and later to buy 2x 1200's with timecode + midifighter or dicers ... for me this is the gear what i should have, but i want to hear your opinions. cheers