As a live-Player the only thing I'm interested in with the QC is it's behavior when cranking a given profile/rig/sound (or what it's called) to gig-level.
If it will "compensate" the Fletcher-Munson-Effect "automatically" (so that no tweaks have to be made, which btw. I don't expect ) I probably would buy it without hesitation.
The profiler is able to sound awesome even on gig-level (don't get me wrong), but it needs a lot of time-consuming tweaks. This is the only aspect of improvement I see for the Profiler.
For just studio-work the QC never would be an option for me. The profiler with it's corresponding giant "profile-market" doesn't leave any wishes open for me.