Omar,

In a word, YES, there is a notable difference to the better. However, there are not that many BR movies out with DTS:HD-Master, or even DTS:HD-High res sound tracks. I suspect we will start seeing more though. So far, the few BR disks I have with DTS:HD tracks have been quite enjoyable and not to pop bubbles for the PS3 users, but the uncompressed DTS tracks are superior than the core tracks you hear when using the PS3.