here are my picks:
1. Olli-H
Smooth, warmish sound, I really like it, suits the mix nicely I find, doesn't have that harshy 'digital' edge as some others have (watch your plugins people! , they are certainly not all for mastering nor can be use anywhere or to a certain amount) anyway, back to Olli's master, pleasant sounding one what else can I say?

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2. DodgingRain
Good well-rounded master, pretty close to Wizzo's, I ultimately picked your master for the 2nd place cause the fluffy-warm lower mids + a nice stereo image there, gives a good visual image of objects in the distance. Also, chunkier snare than in Wizzo's mix, not as brash and dynamic in the highs as his, not that it's bad, but there's a difference.
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3. Wizzo
I must admit that your master got interchanged quite a bit between 2nd and 3rd, reasons mentioned above. Anyway, still a well-balanced master.. not sure about the stereo image, what did you try there? seems totally different but a bit weird. Are you messing with some M/S or band stereo tools? are you mastering on headphones?
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Special mention:
vintage
your master seems great, almost got a place in the podium, ... the sound feels a bit over-compressed especially for the type of song this is, but a cool master nonetheless
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also a pretty interesting one: jonaslasse
over-compressed and deep sounding, also you seem to have totally mangled the stereo image
