According to this guy Sky Sport Now is in 1080p
That's streaming, not satellite. The argument/comparison was to do with rain fade etc, which streaming doesn't suffer. The first guy that was quoted made no mention of Sky Sport Now, only Sky Sport, which is demonstrably lower quality than Spark Sport.
Anyway, as I said I do wonder if Spark should reach out to Sky to help get a solution. Sky is the expert here and Sky's platform has been rock solid.
Apples and oranges. Sky's world cup broadcasts were using satellite television infrastructure.
Spark has a lot of smart people working on this. The problems described here in this thread are related to the first 2 days of the tournament being streamed on a new platform. I imagine there's a lot of smart people working night and day to tweak and tinker with the infrastructure to improve things they've learned over the last 36 hours.