I know it is - it has 6x as fast SSD, couple of times faster RAM (and even if you page, you page on a super fast 3gb/s SSD not on a 500mb/s SATA3 SSD), but CPU is only roughly 20% better, and this is actually the thing that's giving me the most head-aches right now.
I guess i could eat 16GB RAM if it had more CPU cores, especially due to faster paging.
You guess right tho - I'm one of those audio guys.
Running low on juice right now, some of my plugins eat up half of a core. (2C audio B2, u-he Repro-5) - not because of shoddy programming so i can't hope for optimisation there, and on my recent project i was pushing it to the limit. Having 20% overhead is nice - for a year or two, but not for 5 years, and not worth 4k as such an upgrade would cost me.
There's really no real upgrade option from Apple aside iMac Pro - I would gladly take Trashcan if it had TB3/usb-c ports. I would gladly take MBP if it had.
iMac Pro seems to be it - except i need it to be at least semi-movable. (I sometimes work from home and sometimes from studio. Trashcan is easy to carry, 27" iMac is not.)
i will probably wait for a refresh (as average is ~300 days)
https://buyersguide.macrumors.com/#Retina_MacBook_Pro
and then dive in, 6 cores or not.