I'm like you in that I prefer a smaller phone. I did not directly switch from the MX13 to the Z3c but I have had both devices. To me, the Z3c is an awesome device...battery is nearly double what I was getting on the moto X. Things I liked better on the moto X? Motorola's customizations, the near stock UI and the way the curved back felt in my hand. I've had quite a few phones in the past year but keep coming back to the Sony. I really hope there is a Z5c on the horizon.
I play with my food