Even you seem to have those nasty lines, but they are running diagonally across the screen for you. Further, motion blur is disabled, edgeaa and ssao quality is lower in the ultra config.
Check out the horrible vertical lines running across the screen.
Also notice the detail on the ground below and above the line -
Also in the comparison screenshots that you have given, what quality of CCC mod are you using? Is it LVL 3,3.5 or 4?
The HD4870 config has a scope for improvement, its not bad, just needs a bit of tweaking. For now, for ME, the CCC LVL 4 config gives the best visuals while running well.