This week Comcast launched a major ad campaign that opened a new battlefront in the HD service provider war: comparative picture quality.

Touting a study by Frank N. Magid Associates, Comcast took out full-page newspaper ads in 15 markets claiming its HD picture quality is superior to satellite competitors DirecTV and Dish.

"We always knew we offered more HD choices, and we always thought we had more convenient HD service and better HD picture quality, but now we can prove it by a fairly overwhelming margin," said Page Thompson, senior VP and general manager of video services at Comcast.