It has more to do with the length of the cable than anything. My bandmate Steve was a firm believer that a coiled cable sounded better than the same length straight cable. Then, Eric Johnson made it so.
Frankly, the treble and presence controls on the amp mitigate the need for a coiled cable. JMHO.
I do, however, have a coiled cable in my gig case, if my wireless units fail. It's more of a trip precaution than anything...