Supra 3/4S Speaker Cable Upgrade?

I'm currently using 2 double runs of Supra 3/4S to my ProAc Tablette 50 Signature. I'm thinking of upgrading to a single run of Supra Sword. I'm wondering what kind of sonic improvements I can get out from this change. Any advice? Thanks!
I have heard the swords in my brother's system and they are amazingly detailed, but he did not have the 3.4S so I don't know how they compare. It got me thinking about Supra and double runs of the 3.4S myself, what are your impressions of them? The Swords are a bit too much for my budget, especially with biwiring.