'Sax' obviously takes one or two cues from 'Uptown Funk' — and why wouldn't it — but there are also nods to 'Christmas Wrapping' and 'Buffalo Stance' on a song that doesn't dick around vis-a-vis Fleur's whole "here's an actual popstar" approach to pop domination.
The other Fleur tracks we've heard move her away from the 'Uptown Funk' blueprint but are just as great, so it's all quite exciting really.
(The "get loose, get right" bit is clearly the best bit.)