Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
R>Q>E>W (1 rank of W at lvl 3 or 4)
I prefer Sorcerer's boots, but go with Ionian boots if you like, it makes about ~12 sec difference on ult lvl 1 and ~9 second difference on level 3. After I build Archangel staff I might go for more CDR rather than Rylai's or Zhonya's hourglass dependent on the situation.