That's a negatory Chris.
There's a world of difference between the d12 and d112. Honestly, they're not interchangeable at all.
D112 is surprisingly useful for a super-scooped deep radio voice kinda thing, but the d12 is pretty much the opposite.
I wish i had a bass amp or a kick drum. Id do a wee test too! lol
**edit. you mentioned the 421. Henry prefers the re20 and i prefer the sm7b, but i think the md421 is a better 'all rounder'.
It just does everything well IMO. Vocals and all. You don't hear that all too often, but i love it.