Comparing games I'd recorded off Foxtel in past years to Kayo streams, the drop in quality is very obvious. And Foxtel wasn't great to begin with. Stopped bothering with Foxtel once they became a streaming service, because if it's just going to be streamed anyway then I might as well go the cheaper Kayo option.
Switched to D+ a week or so ago because most WNBL games will be D+ exclusives*, and the quality seems similar, but different. It seems like pretty much the same level of actual detail, but with some artificial sharpening added on over the top which could make it look better or worse depending on what you're more sensitive to.
*They're also on 9Now, but the quality on there is absolutely abysmal.