My TF10s just came in the mail. They are huge compared to the X10.
First impressions is that the articulating edges are definitely sharper than the X10 which gives a more forward and aggressive sound, compared to the smoother and rounded sound of the X10. The bass quality on the TF10 is fantastic. It's very deep and textured. The mids are more recessed on most recordings that I'd like, which may be a deal-breaker in the end for these.
Weird thing about the TF10, is that the transition from the bass to mids isn't very cohesive. It's hard to explain. It's like sitting in a car with big subwoofers -- where the bass doesn't sound well integrated with the rest of the music. Whereas the X10's bass muddies the midrange a bit, the TF10's bass slightly overpower the midrange without bleeding into them.
Not sure which one I like better yet, since I've spent such little time with them. I feel like the X10 plays it safe and makes no real missteps in its presentation, while the TF10 sounds more hi-fi but has a more glaring weakness, in my opinion. If I could combine the forward midrange of the X10, with extension of the TF10, I'd be quite happy.