I imagine the 914 sounds pretty similar to the redesigned 814 - same woods, same bracing, same finish...just different aesthetics. The few new 814s I've test-driven have all sounded good - a bit more vintage in sound, but very good. How much different can the 914 sound with the same basic build, same standard carve neck, etc.? I'm fairly certain that armrest, backstrap and paua inlay do little to raise the bar in sound and playability.
I wish that Taylor would introduce more variety to their base rosewood offerings or perhaps offer fewer iterations of Sitka/rosewood guitars. It was a bit different in the day when the 900s were defined by engelmann spruce tops, the 800s by sitka spruce tops, and the 700s by cedar tops. Today it seems to be more a matter of wood grading for aesthetics only, along with the different trim packages. It's a bit repetitive to me.
Just rambling here...to each his/her own.