Jeff_jones, I have performed the test you ask about. I used Apogee Wyde Eye in 1-meter and 1.5-meter lengths. I made the cables up using Canare RCA connectors and 2% silver solder. A pal and I did listening tests using his Theta transport and Kora DAC, and my TEAC transport and Apogee DAC.
The difference was notable in terms of sound source positioning and delineation, depth and width of soundstage, orchestral focus and cohesion. In general terms, the music was less confused, more coherent, with the longer cable. We had no doubt that longer was better.
Higher quality cable does make a difference. In some ways I preferred a 0.5-meter Zu Ash to a 1-meter Wyde Eye. However the 1.5-meter Wyde Eye would have been my choice even over the more expensive Zu, if the Zu cable were just a half meter long.
Chadnliz, the Steve you refer to is of course Steve Nugent of Empirical Audio. His moniker here is audioengr.