But they've rolled out to their recent devices, and now are even rolling out to the older line up. The Xperia Z is about 2.5 years old!
Here's the list of phones getting the 5.1.1 update:
Xperia Z (C6602, C6603)
Xperia ZL (C6503, C6506)
Xperia ZR (C5503)
Xperia Tablet Z (SGP311, SGP312, SGP321)