I think your wrong... Badly wrong,..
Last time I checked this (to put another conspiracy theory in its place), the following situation existed:
DVB-T vs Sky Rebroadcast of TVNZ
Identical Resolution, as near to identical bitrates as you could see, without putting the signal through some sort of time base correcter, to compare exactly. ie there was no perceivable difference, and no difference in the actual signal. It looked every bit like a straight signal pass thru...
DVB-T (TVNZ or TV3) vs Sky HD.
Sky run the same resolution as TV3 (1920x1080i), but usually at higher bitrates. With domestic sport, this commonly averages 18-21Mbit. This is well over the average you see on TV3. Generally on like for like equipment ie same TV, same cable, same graphics card, Sky looks the best of any NZ domestic broadcast.
But dont let the facts get in the way of another pointless bash on Sky will you...