Hi, I managed to buy some Sennheiser Momentum Wireless around ear headphones for £267 (down from £379) on amazon and am debating whether to keep it. Generally these are more expensive than the QC35 (£329). The QC35 are more comfy and have better noise cancelling. There is no doubt about this. But I'd like to know more about sound quality. I've read many many reviews pointing out that the sound quality is better than the QC35s. However, the reviews all point to the apt-x codec which Apple does not support. The QC35s support AAC audio. I don't know much about either but I understand this: apt-x = better sound over Bluetooth. AAC audio = better sound over Bluetooth. By this equation, QC35 supports better sound for iphones. Momentums sound great over non-iphones (when using Bluetooth). Which sounds better with iphones generally USING BLUETOOTH?