HAVE CABLES EVER TAKEN YOUR SYSTEM FROM SOUNDING JUST OK TO SOUNDING GREAT? Experiences ?

I will say (different sounding) not better or worse 

In this hobby we're always attacking the weakest link. Often that's a component, but once the components have been upgraded the cables become worth a look. 

When i had a separate streamer and dac, the upgrade to a Tara RSC digital cable made a big difference. I had a good rca to my preamp.  Once I upgraded to a much better streamer/dac it became worthwhile to upgrade the rca interconnect to my preamp. It further improved the sound by a large margin. 

Same for preamp to  power amp, as well as speaker cables after other system upgrades.

We had a system at a show.  Changed the cables it was like night and day. 

After buying the digital cable in this review, my system went from 2D to 3D. It became even more so when I went with a full loom of the same series of SR Atmosphere signal cables.

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Two days ago, I swapped positions of just two power cords that were already in my system. On a certain cut, a triangle went from the center of the sound stage to center left. After grounding the cable, the triangle went to the far outside on the left.

Had larger than expected differences with three different sets of Vandersteens over the years. They seem sensitive to different speaker cables.