The bottom fell out of the SPYs on the Fed's announcement on Wednesday, but they more than made that up on Thursday and Friday. The SPYs had a strong rally over the last two days. The SPYs also ended up the most of the three averages.
While the QQQQs did end the week on a high note, they didn't get there by the best technical path. While the QQQQs shook off the Fed news on Thursday, they fell a bit on Friday morning, and only closed at decent levels after a sharp spike. My guess is there was a program trading reason for that move.
The IWNs chart was similar to the SPYs. They ended the week on a solid note with a strong upswing after the Fed's announcement.