I would agree with Eke on the vocals and treble in regards to the Gr07 MKII and the XBA3. I actually prefer the harsher treble of the XBA3 which is why I never kept the MKII very long. As for sub bass I think they are pretty similar going from memory but the XBA3 has a bit more mid-bass which may mask the sub-bass. This isn't to say it has a mid-bass hump like a lot of other IEM's but it does have more mid-bass presence than the GR07.
Technically speaking I would also agree with Eke that each of the IEM's he reviewed are good options depending on what you want. Each has it's own merits and weaknesses regardless of price.