The maximum streaming quality from the NowTV smart box at the moment on their streaming service including Sky Sports is HD 720p.
More info here.
1080p is coming to the service sometime this year
Hopefully they will also up the frames per second rate from 25 to 50fps when offering 1080p to make a much better sports viewing experience.
Yeah 1080p at 25 fps would most definitely be a noticable annoyance especially in action and sports footage! At least 50fps needs to happen.
A Now TV Boost side subscription is Now available which allows 1080p for all content and Sky Sports Channels at 50fps.