This is tough.....as I've had in the bag often...but I can't compare.to the old as I've never played it.....feel is solid, no hollowness or tinny sound, but is it a tink or a thwack....more of a thwack sound....it's really non- descript IMO....don't notice it, whereas the Cobra f6 is more crisp feeling, tiny bit harsher.
I suspect there will be little to no difference, but....only one way to know for sure!
Dollars to donuts the 919 is the best overall driver I've played when you factor in the whole ball of wax, price, forgiveness, feel, looks, and ability to customize.