My only concern about this comparison video is that there isn't much playing low on the heavy strings, and that's where the lower-midrange "woof" of a Singlecut is most evident.
This player's fingerpicking touch appears to be very light on the heavy strings. That isn't really going to create enough amplitude and dynamics in those frequency ranges to enable one to hear a difference between the two guitars. Most of his work in this one is being done on the upper strings.
My SC guitars, including my current McCarty Singlecut, have all exhibited more lower midrange energy than my 594. It's shown up on frequency analysis software. This doesn't mean one's better than the other at all, but I find them to be different.
The video is great insofar as it goes, but I wouldn't reach any hard and fast conclusions about the differences between the two models. My thinking its that it's great to have both kinds of guitar.
This body thickness thing really came to life for me the day I played the new McCarty Trem and the CU24 30th PS back-to-back. Picking up the CU24 after playing the McCarty, it was like a high pass filter was used to cut the lower midrange.
This is great when you want a guitar to cut through a thick mix, and not obscure the bass and kick drum BTW, it's not a complaint. I love the CU24 for its ability to cut, and its midrange emphasis due to the placement of the bridge pickup.
But the bottom line is, horses for courses.