+1 to what cr6 said.no stock android, no thank you. i like the design but these oems just butcher android and it losses its smoothness.
Also, the Xperia UI is minimalistic, not quite as much as Moto, but it definitely is a very close to stock Android experience. It is especially minimal compared to say, TouchWiz, which was known to really cripple older Samsung devices. However, devices such as the s5, and soon to be released Note 4, really don't feel any slower because of TouchWiz since they're such powerful devices.