I did an A/B with different cables just about a few weeks ago. I used Klotz, Nobelle, ProEl, Planet Waves and Quantum cables. Yes, there are differences. I feel that Klotz and Planet Waves gave me the better frequency responses. But surprisingly, the ProEl cables from Italy made in China, about PhP 500.00, came out with a very good result. Although I never really did any measurements, I just relied on my hearing which I believe, is still pretty much "in there," above are my findings. I posted this sort of informal experiment in the Guitar site previously. So, YES, there are differences in cables (I never also believed in his matter previously, as I attended a "shoot out" in one AES convention where top notch engineers were made to identify speakers connected with the esoteric cables and one with a simple THHN/THWN cable, and they had a hard time indentifying which were the esoterics and ordinary wires. Now, I am a believer). BTW, the longest cable I used was 5 meters.
Also, another variable is the connectors. That one I did not consider.
FWIW.