Seems you have a case of a selective memory because the case in question had some more arguments than round corners. It's intellectual dishonest to reduce it to only that.

Samsung was being caught having a 155 manual (http://www.theverge.com/2012/8/8/3227289/samsung-apple-ux-ui...) of how to copy the iOS UI. That alone is so clear that it's not even funny.

That's a fact the iHaters always seem to left out, but the round corners on the other hand...

I find it very hard to believe they won that case on the pure fact another device had round corners.