Windows 8.x mouse and keyboard is polished but for touch and pen input it's not as polished as Android such as Galaxy Note series. However, UI is software so I don't doubt it'll continue to improve over time.
Boils down to a race between Android and Windows. Windows has the advantage of professional software like OrCAD, Inventor, Catia, Pro/Engineer, etc. but survival is dependent on Intel/AMD making a power efficient CPU/APU with performance, user experience and battery life comparable to ARM. Only hurdle is Intel is already at the limits of process node with 22/14nm. Android, on the other hand, has better touch and pen input UI polish plus ARM efficiency and user experience advantage at 32/28nm so it has a lot of room for improvement. Only thing missing is professional level software but considering the sheer quantity of devices, quickly evolving segment and high adoption rate due to low app prices I can see this quickly changing for the better especially with more powerful and capable devices coming in 2015. Very possible Android plus ARM will continue to lead in mobile and may even overtake Windows plus Intel/AMD in laptop, desktop and server.