IanB52
100+ Head-Fier
I'd consider HD800 to be significantly brighter and lighter in the bass than Susvara.I have the Focal Clear and HD800. I'm thinking because the vocals are so much clearer/brought forward that it makes the bass seem less, even though there might be the same amount. The remaining part for me to figure out is if a much more exp amp will be worth it and boost the bass/warmth noticeably. Since I believe ultimately it's the combination of everything that determines listening pleasure and not technical supremacy alone.
Honestly, sometimes just a warmer sounding aftermarket cable will do the job. I use solid state amps and no EQ, and right now my Susvara leans heavily to the warm side of things.