I neglected to mention that my phone is actually a customized China-only Xperia SP running on China Mobile's proprietary 4G network. It is called the Xperia SP M35t, and with the exception of more ROM (16 vs. 8)? and I'm assuming a chip that allows it to run to the LTE variant network.
Obviously I'm hoping that it would have no bearing on this conversation, and an AOSP ROM would be able to have all required drivers to run my phone properly. That I guess is the crux of my question.