I'm using a retina,
everything (especially the interface) is so sharp and clearer the update.
Just wondering if Riot had anything to do with it
Yes, the PvP.net Client is now Retina-compatible once more.
However, it's because 3.9 included an update to Adobe AIR, which now automatically does Retina business. So technically Riot did not, in fact, have very much to do with it. ;P
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