Uhm, for week #15 the difference between "Sugar" and "Uptown Funk" can really decrease, UF is gonna loose many streams in the next weeks as it's looking..
Maybe 100k sold more than UF and the #1 is for M5, although I just don't see it happening. "Sugar" is a very very big hit, their biggest since "One More Night". People just adores to listen to it, it's a nice pop track, and it has Adam's sweet voice that everyone should love because it's Adam, of course.. Anyway, the song is a kinda old so getting a huge boost is unlikely and more coming from a not "massive" platform (ex. Grammys).. It's going to be very interesting