I would be front row for a bass paper test with sine waves
I have heard the Abyss maybe 5 times and the bass is faster of course but the diaphragm design is not for slapping your face. I'd still be front row virtually if you ever compared bass.
I use the SZ with rock and roll. The suggestions and placebo effect of them had convinced me of it's inability but with a good stream of power and a eq fetish I was listening to Aerosmiths greatest hits last night and was
at the show.
Interestingly these do not play .FLAC files of rock well as the highs sound grindy (to me) which I have never in one year heard before. 320kbps files of same track and vocals were like smooth butter again