I had a Galaxy S1 (Wolfson chip) too with Voodoo kernel - fantastic sound quality. Pretty mediocre sound quality with stock kernel.
Now I have a Galaxy S3 (Wolfson chip) with Boeffa kernel - same or better sound quality than S1 Voodoo. Stock kernel sounds good but not awesome.
Samsung phones with only stock kernels installed should not be judged in terms of sound quality because they can do much better with custom kernels like Boeffla, Perseus, Siyah,...
American Galaxys might be differnt though as not all models have that famous Wolfson chip on board.
I agree I believe most people on here base their judgment on the S3 on the USA version. Which does not have a Wolfsan DAC. I have a UK version of S3 and I am very happy with the sound of it. I to use the Boeffla Kernal and it sounds amazing. It actually sounds better then my Voodood SG1.
Edited by Ince - 10/1/13 at 10:24am