The Sprint version of the HTC One is actually the one that we have reviewed. Ever since, some carrier versions as well as the global variant have received a refresh improving several aspects of the device, including its performance and camera.
HTC One users on Sprint should be getting a small over-the-air update, bumping the version number all the way to 1.29.651.10. According to the changelog, the refresh should bring “Improved Back and Home key sensitivity”, alongside “BlinkFeed improvements” as well as a new version of the Sprint Zone app. You can check for the update’s availability from within the settings or wait for the notification to land on your device.