the difference is easy to hear. i tested ie800, and they are not even similar to ie8. they seem much clearer, everything seems much more real, like you awake after a long dream
ectremely vivid...
how do i put it, ie800 are around 15% better than ie80s.... it is another world, but you can see that ie80 were not that cheap either... i was shocked when i discovered that ie800 was that much better. i expected them to be just a little better. all even after having ie800, ie8 are... their own thing. with a different soundstage, different bass, and different CONFORT!
comparing them, ie8 are much much easier to wear, are much more confortable, and provide a different, assuring feeling. even though ie800 are iems, you cannot really sweat with them, as they will harden, and they are microphonic. Not that bad, but if the split moves, you hear it move, if you have beard, you hear the cables touching every single hair from your beard...
all in all, for walking and enjoyment, ie8 are easier, while ie800 are much more better sounding.