To state that the player makes a bigger difference than the guitar is stating the obvious. However, if the suggestion is that it doesn’t matter if a great player is playing a great guitar or a mediocre one this is a false assertion. Sure, a great player can make good music with a mediocre instrument, but he can make great music with a great instrument. The comparison in the video clip:
The difference between the $200 and $2000 guitars is immediately obvious. The $200 instrument sounds thin, almost ukulele like in the high register and lacking in color. The $2000 one is much richer sounding and with greater presence. The differences between these two instruments is, to my ears, greater than those between the $2000, $20,000 and the $200,000. My favorite is the $20,000 guitar. The player in the video, hardly a guitar genius, seems the least comfortable with the $200 guitar and the most comfortable with the $20,000 one as demonstrated by his phrasing and overall musicality.
It is very possible that a truly great player could coax the best sound out of the $200,000 instrument. With all instrument families there is a difference between “playability” and ease of playing. An instrument that is “easier” to play doesn’t always give one the best sound. Some instruments demand the familiarity that only comes about by living with the instrument for a significant amount of time in order to learn how it responds best.