Season two of the tight battle between the silent Finn and the passionate Brazilian. Last year, Bottas was more consistent and because of that managed to beat Massa on points by quite a big margin, though the gap on track wasn't that big.
In races where both drivers finished, Massa was very close to Bottas and seemed faster most of the time. Especially near the end of the season, Massa seemed to have an edge over Bottas.
2015 promises to be just as tight between them as 2014. My guess is Bottas will beat Massa on points again, because the Brazilian always seems to attract bad luck or has a slump in form for a few races, whilst Bottas seems consistent through an entire season.