Actually, the ringing was much worse originally. Here's a comparison for the frame with an ancient super resolution version:
http://screenshotcomparison.com/comparison/128260
Here are a few more comparisons. This time to the simple upscale:
http://screenshotcomparison.com/comparison/128261
http://screenshotcomparison.com/comparison/128262
http://screenshotcomparison.com/comparison/128263
http://screenshotcomparison.com/comparison/128264
http://screenshotcomparison.com/comparison/128265