and even on-net vs off-net
Although Telstra is not my ISP, because my ISP (TPG) couldn't put its own DSLAM in the exchange, I am on Telstra's kit. It would be interesting to see say, my neighbour's (offnet) Optus vs my (offnet) TPG vs across the road's Bigpond Netflix streaming speeds as we all seem to speed test within 1-2 k of each other (@ 11-15MB most of the time - depending on weather/day/time/how I hold my mouth) as we are all on the same DSLAM and have virtually the same path (neighbour's is 16 m longer).
Biting the hand that feeds IT
