I'm extremely satisfied with the cirrus chip in the iPhone 5. I found the 4 and 4S to have a lot of roll off on the lower frequencies leaving the highs a little harsh and "bright" I tried a Galaxy S with the Wolfson chip and voodoo sound and was overjoyed with the results. I would put the iPhone 5 on the same playing field now if not slightly better. The bass does not roll off, the mids are there and the highs are not as bright. I don't know what apple have implemented in this version but the over all performance of audio and the speed of the phone is simply a joy to use. I'm using the same set of IEM's for all tests (Yamaha EPH-100) I have to say the Earpods sound much improved too, I don't know if they will be as good on the other models though! How is everyone else finding listening to their music on the iPhone 5?