I agree, the ISA sounds brighter but imho that is not necessarily my preferred choice. I'll explain my theory. This is what I meant when I thought this mic sounded more natural through the FF800 and would take EQ better. The ISA sounds altered (scooped as you nailed it) like an exciter was incorporated into the design. I'd rather have the option to "scoop" or add excitement via my EQ where needed. Thus, the ISA would not be my choice for brighter upper mid sources. The ISA is limiting tracking uses for me which is why I prefer the FF800 in this comparison.