I have always been under the impression that only Exinos versions of Galaxy line-up could feature Wolfson DACs as Qualcom has its own. Now, that this subject is brought up, I just can't say where I got this idea from, although I've been sure 100% about it. I also thought that both DACs are very close in performance (although Wolfson has some magic about its name, of course).
Anyway, the official version here is the Exinos one, aka 9000. We won't have LTE till Kingdom Come and 4K video on a phone seems gimmicky to me. On the plus side the word "copyright" is somewhat strange here so a good audio player is just what the doctor ordered and that is where a Wolfson DAC comes in. Samsung's marketing knows its stuff well LOL.
Though usually there are a lot of unofficial models on the market, with the recent region lock introduced by Samsung the inflow of 9005 has stopped (until dealers find a way to bypass it, I suppose) so there's no way for me to sample the sound of it. LG G2 has the same Qualcom chipset but I doubt the comperison would be fair.