I just got a new cable on my T5p's. The cable is pure silver and about the same length as the stock cable. I will try to be careful not to let me be carried away in describing the change but I fell like I have got myself a new pair of headphones. The attack and speed is better, they have become faster, snares just hit like a whiplash, the sound is clearer and more airy, the bass is faster, everything is more controlled. Definitely an upgrade. It could also just be that I have missed them the two weeks they have been away for the cable change - so do not put too much into my initial impressions. If I knew they would be that much better I would not have hesitated so long to have the new cable mounted.
A couple of pictures: