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e: If you run the game with AA at 1080p, the AA is applied before it gets upscaled. The result is still a blurry image. If you runt it at a native 4k, regardless of the texture quality, the result will look better simply from not being blurred.
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The difference between Full HD and Ultra HD (4K) is negligible in most normal situations anyway. It's completely useless for any screen smaller than 65" so most commonly sized desktop monitors don't benefit from this at all unless you press your nose against the screen. For TV's you may make out extra details if you sit uncomfortably close to the TV, but at regular viewing distance you will barely, if at all, notice the difference.
I've actually been shopping for a new TV not too long ago and was torn between Full HD and Ultra HD as well. Ultimately, after watching the TV's in the store, I wasn't able to spot a significant difference from a distance. Also stores tend to fool you with the TV settings. I found that the store I visited had the color and black values for Full HD TV's dialed way back compared to Ultra HD TV's (which they want to sell), which made the Ultra HD TV's look better. But when I managed to put the Full HD TV's on the same color level (when no-one was around :P) the difference pretty much went away.
Sharper picture doesn't always mean better. I'd rather have a screen with really good color and black values instead of one with a huge resolution. And this is what I ended up buying. I bought one the last Full HD plasma TV's I could find and while it may not be Ultra HD, the picture quality is much better than what a 4K LCD/LED TV is able to produce. So on that note, if you're in the market for a new screen, stick with Full HD for now and save your money for when OLED becomes affordable in a few years. Then 4K will already be the standard and trust me, the store I went to had one Ultra HD OLED screen on display. It was 30.000 Euro's, but it is the hottest and sexiest picture you will ever see (until even better tech comes along). Nothing can beat it for color, black values and resolution.