It could also be the trucks being used to process the data (these are mostly rented/leased by the sports departments/studio since it is easier to deal with a local truck/production company tha to drive your own truck across country all week long to each different event...also it is cheaper than owning your own fleet of trucks), the producers/directors who are running the show who have "different eyes" for the PQ, the varying uplink quality from said trucks, or the different cameras used. So many variables from live action to shooting to processing to posting to downloading to displaying. Any one of those steps is out of whack, the whole show/event can look horrible.