I found there was a difference between the stock I2S cable that came with my Northstar combo versus an upgraded cable I purchased from Revelation Audio Labs (buyer beware - I got my cable in 2 weeks but others have had horrible experiences with this vendor and they are banned from selling here). However, I would say the difference in sound did not justify the price difference.
FWIW - Steve Nugent at Empirical Audio made some I2S cable comparisons and found differences between various cables.
FWIW - Steve Nugent at Empirical Audio made some I2S cable comparisons and found differences between various cables.