Nope, my tv is HD and I've played on a friends HD tv and there are jaggies everywhere in most games,
For example, I play Far Cry 2 on my PC on the highest settings, no aliasing at all, 60fps with some dips into 50 and 45 fps. Amazing graphics. On the PS3 at my friends, there are jaggies everywhere, running at 30fps at the most, and the graphics are significantly worse.