When I first bought my KEF LS50 wireless three years ago, I had a couple of Cerious Technology power cords lying around. I put them on the LS50s and didn't notice any meaningful difference ... if anything I thought the sound was a bit less open (but honestly, that could have been me straining to find any differences). I put the stock cables back and this is how they've been used since then.
As an aside, I recently bought a power cord from Audio Envy and swapped my Cerious Technology PC on another amp ... the AE power cord seems to add a level of refinement (more cohesive, less sparkle) over the Cerious. I only have one Audio Envy PC so not possible to use it with the LS50Ws. AE cables are very affordable and they offer a 45-day trial. The best way to find out is to order some and try them for yourself.
As an aside, I recently bought a power cord from Audio Envy and swapped my Cerious Technology PC on another amp ... the AE power cord seems to add a level of refinement (more cohesive, less sparkle) over the Cerious. I only have one Audio Envy PC so not possible to use it with the LS50Ws. AE cables are very affordable and they offer a 45-day trial. The best way to find out is to order some and try them for yourself.