Couldn't see the difference after 4x tbh, not on that vid or my game back when I tried. But a huge impact for 2x and 4x, still think you could've picked a better spot. But nice for people to see I guess.
The reason staircases are good, is because they show you a lot of long straight lines ( the best surface to see AA ). Grass/leave/etc are really bad. A lot of AA methods won't bother doing anything to grass/leaves/etc.
Yeah just forget about it. All I tried to say was this: I think more objects that are susceptible to AA would've made the difference more clear, there's plenty of places or models in TERA that benefit from Anti-Aliasing. (removed the previous posts just so it doesn't make more heads spin, I should have simplified it before I put it down so I wouldn't have had to struggle using the correct words)