She reminds me more and more of Jessie J. Not in a good way.
I love Demi but on this I have to agree. Her vocals started off as being so warm and powerful but in a warm way!!! just like Jessie! now both of them sing ina very sharp/cold/pitchy voice. it's become too loud and it lacks "wideness" like their voice sounds like an arrow instead of it being a bi blast that covers a lot of space if that makes any sense?
So clear and effortless. 
her best performance this era