I canceled Prime a year ago, just before their announced price increase, and it’s been great. I sign up for free, month-long trials of Prime on their website a few times a year, and I just accept slower, free shipping the rest of the time.
The version I have looks and sounds so much better than the blurays I have...
Tho like you said better audio, widescreen and I'm fairly certain it's been ai upscaled as well.
I'd have to go back and look but my physical disks don't hold a candle..
SG-1 was shot in widescreen from day one, on cameras that had framing marks for 4:3 and 16:9. A 4:3 cut was sent to TV networks and a 16:9 cut was canned until the show was released on DVD.
That's not always a good thing. If it was meant to be 4:3 the extra space on the frame can have set rigging, lights, microphone booms, and in case of stunts even crash pads.
It's one of the reasons the HD rescan of Buffy:TVS sucks. That still needs a proper 4:3 HD remaster.