[Zigurd]

Sailfish has a Qt-based UI stack. It may also not depend on one specific application runtime environment as much as Android does.

There are also some hints that Sailfish is taking an approach similar to Ubuntu's for touch and GPU support on mobile devices and blending Wayland with Android's compositor.

In other words, Sailfish is likely to be closer to a mainstream interactive Linux OS, and a closer cousin to Ubuntu, Firefox OS, Tizen, etc. than is Android. It's different times now, and you don't have to diverge so much from the Linux mainstream to create a good touch user experience.