Yeah, not sure what's been up with SunTV lately. Their local Ottawa OTA broadcasts of Smallville and Supernatural this week were both windowboxed (the term given to this "boxing"), same as the BTV feeds. And 2-channel. Fortunately, this week someone at BTV was awake and pulled the plug on the simsub for WGNHD after a few seconds of Smallville, and restored the fullscreen/DD5.1 WGN feed.
Last week, the Smallville/SunTV simsub started out windowboxed, but BTV temporarily switched back to WGNDT fullscreen/DD5.1 after a few minutes. During the first ad break, BTV again switched to the SunTV simsub, but it was now fullscreen/2-channel, and remained that way at least until a minute after the start of Supernatural (at which time my Smallville recording ended). Closed captioning was absent until about 27 minutes into the show.
Through the regular broadcast season, the local Ottawa OTA Sun HD feed for Smallville/Supernatural was normally fullscreen, with a DD5.1 carrier. As I said above, not sure what's going on now. Hopefully in the future, BTV and SunTV will get things worked out, and we'll get a proper fullscreen/DD5.1 feed from SunTV.
Moderator: I know there is a separate discussion for faulty simsubs, and was planning to post most of this there, but as new channels are added, I think we also need to compare their quality vs. any channels they may be supplanting (via simsub), so I think some initial observations are also relevant here.