Neither Univision, nor Telefutura air a single program in HD in Chicago. Neither channel is setup for HD either, as I still use my old NTSC TV with converter box, and have it set for letterbox. So I know if they were setup for HD or not. Both stations are basically simulcasting each other on each other's subchannel. WGBO is also on RF 50.2, but has PSIP set to 66.2, & WXFT simulcasting on RF 38.2, but has PSIP set to 60.2. My PC TV tuner card (separate from my converter box, which only displays PSIP channels) goes by RF channel, which is why I know they're simulcasting on each other's subchannel.
Telemundo station WSNS is setup for HD, but only select primetime programming is actually HD, while the rest of the day, they air programming in SD.